# Mathematics Grade 12 P1 Eastern Cape Mock 2019 Memo (Afr)

> Grade 12 Mathematics Paper 1 memorandum from the Eastern Cape Mock Exam 2019 (Afrikaans), 19 pages. Read online or download the free PDF.

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- Updated: 2026-09-27
- Subject: Mathematics
- Grade: Grade 12
- Language: Afrikaans
- Document type: Memorandum
- Year: 2019
- Exam period: Eastern Cape Mock Exam
- Paper: 1
- Curriculum: CAPS
- Pages: 19

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## About this document

Mathematics · Grade 12 · Eastern Cape Mock Exam · 2019 · Afrikaans. Memorandum, 19 pages. Read online or download the PDF.

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### Page 1

NATIONAL
                     SENIOR CERTIFICATE/
                          NASIONALE
                      SENIOR SERTIFIKAAT

                      GRADE 12/GRAAD 12

                        SEPTEMBER 2019

          MATHEMATICS P1/WISKUNDE V1
         MARKING GUIDELINE/NASIENRIGLYN

MARKS/PUNTE:   150

                      This marking guideline consists of 19 pages./
                      Hierdie nasienriglyn bestaan uit 19 bladsye.

### Page 2

2                                          MATHEMATICS P1/WISKUNDE V1                                        (EC/SEPTEMBER 2019)

 NOTE/LET WEL:

      If a candidate answers a question TWICE, mark the FIRST attempt ONLY.
      Indien ŉ kandidaat ŉ vraag TWEE keer beantwoord, merk SLEGS die EERSTE poging.
      Consistent accuracy applies in ALL aspects of the marking guideline.
      Volgehoue akkuraatheid geld deurgaans in ALLE aspekte van die nasienriglyn.
      If a candidate crossed out an attempt of a question and did not redo the question, mark the crossed-out
      attempt.
      Indien ŉ kandidaat ŉ poging vir ŉ vraag deurgetrek het en nie die vraag weer beantwoord het nie, merk
      die poging wat deurgetrek is.
      The mark for substitution is awarded for substitution into the correct formula.
      Die punt vir substitusie word vir substitusie in die korrekte formule toegeken.

 QUESTION 1/VRAAG 1

 1.1.1    𝑥 2 − 3𝑥 − 4 = 0
          (𝑥 + 1)(𝑥 − 4) = 0                                                                  factors/faktore
          𝑥 = −1 or/𝑜𝑓 4                                                                      𝑥 = −1       𝑥=4
          Answers only: Antwoorde alleen (2/3)

                                                 OR/OF
          Can use quadratic formula / Kan kwadratiese formule gebruik
                       b        b 2 4ac
           x
                                2a
                   ( 3)             ( 3) 2 4(1)( 4)                                           correct substitution /
                                     2(1)                                                     korrekte vervanging
               3           25
                       2                                                                        answers / antwoorde
               x        4 or / of x          1                                                                                 (3)
 1.1.2    2𝑥 2 − 𝑥 − 7 = 0
               −𝑏 ± √𝑏 2 − 4𝑎𝑐
          𝑥=
                     2𝑎
                       ( 1)          ( 1) 2 (4)(2)( 7)                                        substitution/vervanging
           x
                                       2(2)

                   1           57                Penalise 1 mark for incorrect rounding off
                           4                     Penaliseer 1 punt vir verkeerde afronding    𝑥 = 2,14      𝑥 = −1,64

           x       2,14 or/of               1, 64                                                                              (3)

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### Page 3

(EC/SEPTEMBER 2019)                         MATHEMATICS P1/WISKUNDE V1                                              3

 1.1.3    5x 1 5x            2500
          5 x.51 5 x           2500
          5 x (5 1)          2500                                             factorisation/faktorisering
          5 x.4         2500
              x
          5           625                                                     5x       625
              x        4
          5      5
                                                                              x    4
               x 4
                                                                                                               (3)
 1.1.4     ( x 3)( x 1) 12
           x 2 2 x 3 12 0
           x 2 2 x 15 0                                                        standard form/standaardvorm
           ( x 5)( x 3) 0                                                     factorisation/faktorisering

                                                         OR/OF
                                                         +        −       +
                      −3             5                       −3       5

                                                                                   3 x 5 (accuracy)
                                                                                         (akkuraatheid)
               3       x 5 OR / OF x ( 3;5)                                                                    (4)
 1.2       y          2x 1        .....(1)                                     y 2x 1
                  2              2
          3x           xy    y       1      .....(2)

                  (1) into 2
          3x 2         x(2 x 1) (2 x 1) 2 1                                   substitution/vervanging
          3x 2         2x2       x (4 x 2    4 x 1) 1
          3x 2         2x2       x 4x2       4x 1 1 0
               3x 2 5 x 2 0                                                   standard form/standaardvorm
          3x 2 5 x 2 0
          (3 x 2)( x 1) 0                                                     factorisation/faktorisering
                        2
               x           or/of x 1                                          x-values/waardes
                        3
                         2
           y          2       1 or/of y         2(1) 1
                         3
                                                                              y-values/waardes
                      1                                                                                        (6)
           y              or/of y 1
                      3

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### Page 4

4                                                       MATHEMATICS P1/WISKUNDE V1                  (EC/SEPTEMBER 2019)

                                                                 OR/OF                    y 1
                                                                                     x
                                                                                           2
               y 1
           x                                                      ...(1)
                2
          3 x xy y 2
             2
                                              1                  ... 2               substitution/vervanging

           (1) into 2 ,
                                2
                   y 1                         y 1
          3                              y                       y2        1
                    2                           2
                   y2       2y 1                   y2        y
          3                                                           y2       1
                            4                           2
          3y2 6 y 3 2 y2 2 y 4 y2 4 0
               3y2          4y 1 0                                                   standard form/standaardvorm
          3y2 4 y 1 0
           (3 y 1)( y 1) 0                                                           factorisation/faktorisering
                        1
               y                     or            y 1                               y-values/waardes
                        3                    /of
                        1
                        3       1                                     1 1
           x                                 or/of x
                            2                                          2
                   2                                                                 x-values/waardes
           x                             or/of          x 1
                   3                                                                                                  (6)
    1.3    f ( x) x 2 2 px 8 2 p
           For equal roots :Vir gelyke wortels :
          b2        4ac              0                                               b2 4ac 0
                                                                                     substitution/vervanging
           ( 2 p)2                  4(1)(2 p 8)                  0
           4 p 2 8 p 32                            0
               2
           p 2p 8 0
           ( p 2)( p 4) 0
             p     2 or / of p                          4                             p values / waardes
           but / maar : p 0                              p            2

          So, f ( x)                 x2        4x 4
               h( x )           x2           4x 1                                    h( x)    x2 4 x 1
                            x2           4x 4 4 1
                            ( x 2) 2               3
                                                                                     answer in coordinate form/
               TP : ( 2; 3)                                                          antwoord in koördinaatvorm
                                                                                                                (5)

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### Page 5

(EC/SEPTEMBER 2019)                  MATHEMATICS P1/WISKUNDE V1                                         5

 1.3                                    OR/OF                     b 2 4ac 0
                                                                  substitution/vervanging
          b2      4ac    0
           ( 2 p) 2     4(1)(8 2 p )    0
           4 p2    8 p 32        0
           p2     2p 8       0
           ( p 4)( p 2) 0
              p 4 or/of p              2                          p values/waardes
             Turning point of / Draaipunt van f is      2;0       ( 2 ; 0)
             Turning point of / Draaipunt van h is     2; 3       ( 2 ; 3)
                                                                                                   (5)
                                                                                                  [24]

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### Page 6

6                                             MATHEMATICS P1/WISKUNDE V1                            (EC/SEPTEMBER 2019)

 QUESTION 2/VRAAG 2

 2.1.1       3           ;          1          ;      −3           ;       −9

                         −2                   −4                   −6

                                        −2               −2
                                                                                    both terms/beide terme
                 17 ; 27                                                                                             (1)
 2.1.2       2a              2                 3a b        2           a b c    3
                 a            1                3( 1) b         2       1 1 c    3   a   1
                                                       b 1                 c    3   b 1         c 3

             Tn              n2      n 3
                                                                                    Tn     n2   n 3
                                                                                                                     (4)
 2.1.3           n   2
                             n 3             809                                    equating Tn to −809
                 2                                                                  stel Tn gelyk aan −809
             n n 812 0
                                                                                    factors/faktore
             (n 29)(n 28) 0                                                         choosing/kies 𝑛 = 29
               n 29                                                                                                  (3)
 2.2.1        Tn 2n 3
             T53             2(53) 3                                                substituting into 𝑇53 /
                                                                                    vervanging in 𝑇53
                                                                                    answer/antwoord
                         103
                                                   OR/OF
             T53             a 52d                                                  substituting into 𝑇53
                              1 52(2)                                               vervanging in 𝑇53
                                                                                    103
                                                                                                                     (2)
                         103
 2.2.2       Sn          2 [ 2a
                         n
                                (n 1)d ]
                                                                                    substitution into correct formula
             S 29            29
                             2    [2( 1) 28(2)]                                     vervanging in korrekte formule
                             783                                                    783
                                                                                                                     (2)
 2.2.3        29                                                                     29
                     (2n 3)             783                                                 2n 3
             n 1                                                                    n 1
                                                                                                                     (2)

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### Page 7

(EC/SEPTEMBER 2019)                                MATHEMATICS P1/WISKUNDE V1                                              7

 2.3         T4        a 3d                and/en                    T10     a 9d
                                                                                    T10 T4      6d
                  T10 T4               6d
                                                                                    6d (8x 2 y) (2 x y)
                  6d          (8 x 2 y ) (2 x                       y)
                                                                                    d x 12 y
                          6x 3y
                                                                                    substitution/vervanging
                  d       x        1
                                   2   y
                 T4       a 3d                                                      value of a / waarde van a
                  2x      y           a 3( x           1
                                                       2   y)
              2x          y       a 3x             3
                                                   2   y                                                             (5)
                  a       5
                          2       y x                                                                               [19]

 QUESTION 3/VRAAG 3

 3.1         T1       ( x 1)
             T2        ( x 1) 2
                  r       x 1
             for convergence :/ vir konvergensie
                 1 r 1,
                                                                                       1 r 1
                      1 x 1 1
             0        x       2                                                      answer/antwoord
                                                                                                                     (2)
 3.2         When / Wanneer : x                            2
                                                           3    ,
              p       ( 23 1) ( 23 1) 2 ( 23 1)3 ...                                 substituting for x
              p       (   1
                              ) ( ) (  1            1
                                                         ) ...                       vervanging vir x
                          3            9            27
                                                                                      values for a and r
                  a           1
                              3            and / en                      r   1
                                                                             3        waardes vir a en r
                                  a
                  S
                              1 r                                                    substituting into S formula
                                       1
                                       3                                              vervanging in S formule
                              1 (          1
                                           3   )                                     answer/antwoord
                                                                                                                (4)
                                  1
                                                                                                                [6]
                                  4

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### Page 8

8                                         MATHEMATICS P1/WISKUNDE V1                          (EC/SEPTEMBER 2019)

 QUESTION 4/VRAAG 4

 4.1         x   3                                                        x       3
             y 1                                                         y 1
                                                                                                              (2)
 4.2                  2
             1                    0                                       substitution/vervanging
                     x 3
                 2
                   1
             x 3
             2   x 3
             x           5
                                                                         x-intercept/x-afsnit

                              2
             y       1
                             0 3
                     5                                                   y-intercept/y-afsnit
                     3
                                                                                                              (3)
 4.3

                                                                         asymptotes / asimptote
                                                                         x-intercept / x-afsnit
                                                                         y-intercept / y-afsnit
                                                                         shape / vorm

                                                                                                              (4)
 4.4                    2                                                               2
             h( x )         1                                            h( x )           1
                    x 3                                                               x 3
             point of intersection of asymptotes/
             snypunt van asimptote
             ( 3 ; 1) or / of y    ( x               p) q
             y           x ( 3)       1    or / of   y      x 3   1      substitute point of intersection of
                                                                         asymptotes /
                                                                       vervang die snypunt van asimptote

             y       x 2                                                      answer/antwoord
                                                                                                              (4)

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### Page 9

(EC/SEPTEMBER 2019)                         MATHEMATICS P1/WISKUNDE V1                                              9

 4.4                                              OR/OF                               2
                                                                           h( x )       1
                                                                                    x 3
                       2
             h( x )         1
                    x 3
             point of intersection of asymptotes/
             snypunt van asimptote
                                                                           substitute point of intersection of
             ( 3 ; 1)
                                                                           asymptotes /
                                                                         vervang die snypunt van asimptote
              y       x k
                  1        3 k                                                answer/antwoord
             k        2

                                                                                                              (4)
                  y        x 2                                                                               [13]

 QUESTION 5/VRAAG 5
 5.1         (0 ; 8)                                                       answer / antwoord
                                                                                                               (1)
 5.2          y       mx c                                                 c    8
              y       mx 8                                                 substituting T(9;10) into
             10       9m 8                                                 equation of line /
                                                                           vervanging van T(9;10) in
             m        2                                                    vergelyking van lyn
                                                                           equation / vergelyking

                  y        2x 8
                                                  OR/OF
                              10 ( 8)                                      substituting T and Q into 𝑚 𝑇𝑄
             mTQ
                                9 0                                        vervanging van T en Q in 𝑚 𝑇𝑄

              m           2                                                m=2

                                                                           equation
                  y        2x 8                                                                                (3)
 5.3          y       x   2
                                7x 8
                      x2 7 x (              7 2
                                            2)     8 (    7 2
                                                          2)               completing the square /
                      (x       7 2
                                   )   81                                  vierkantsvoltooiing
                               2       4
                                                                            equation / vergelyking
                                                                                                               (2)
 5.4                                                                       x- coordinate/koördinaat
             ( 72 ;           81
                              4    )                                       y- coordinate/koördinaat
                                                                                                               (2)

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### Page 10

10                                       MATHEMATICS P1/WISKUNDE V1                    (EC/SEPTEMBER 2019)

 5.5         Ave gradient/Gem. gradiënt
              y 10
                   1                                                  method/metode
              x 9

              y 10          x 9
                                                                      making y the subject
              y    x 1
                                                                      maak y die onderwerp
              f ( x)       x2 7 x 8                                   equating 2 equations
             x 1 x2 7 x 8                                             gelykstel van 2 vergelykings
                                                                      factors/faktore
             0     x2 8x 9
             0 ( x 9)( x 1)
                  x 9 or / of            1                            specifying coordinates for W /
                                                                      spesifiseer W se koördinate
              y 10 or / of 0
             ∴ W(−1 ; 0)
                                                 OR/OF
                                                                       x 2 7 x 8 (10)
              x 2 7 x 8 (10)                                                x (9)
                             1
                   x (9)                                              equating to 1 / gelykstel aan 1

                                                                      standard form/standaardvorm
             x 2 7 x 18              x 9                              factors/faktore
             x2 8x 9 0
             ( x 9)( x 1)            0
                                                                      specifying coordinates for W.
             x 9 or / of x                   1                        spesifiseer W se koördinate
             y 10 or / of y                  0
             ∴ W(−1 ; 0)

                                                 OR/OF
              f ( x)       2x 7                                       f ( x)   2x 7
              f (9)        2(9) 7
                                                                      f (9) 11
                           11
              f (9)         f ( x)                                    average gradient = 1
                                     1
                   2                                                  gemiddelde gradiënt = 1
             11 2 x 7                                                 substitution/vervanging
                       1
                 2
             2x 4
                     1
               2
             x 1 1
             x         1
              y    0
                                                                      coordinates of W /
                  W        1; 0                                       koördinate van W
                                                                                                         (5)

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### Page 11

(EC/SEPTEMBER 2019)                            MATHEMATICS P1/WISKUNDE V1                                         11

 5.6         x2 7 x 8 0
             ( x 8)( x 1) 0
                P( 1; 0) and / en R (8 ; 0)                                 x intercepts of f
             y 2x 8                                                         x-afsnitte van f
             0 2x 8                                                         x intercept of g
                V( 4 ; 0 )                                                  x-afsnit van g

                                                                            x      1 accuracy/akkuraatheid
                 x           1  or / of 4 x 8                               4     x 8 accuracy/
                                  OR / OF                                              akkuraatheid
             x (             ; 1) (4 ; 8)                                                                        (4)
                                                                                                                [17]

QUESTION 6/VRAAG 6

 6.1          f ( x)         log m x
                                                                                substitution/vervanging
                     3       log m 64
                 m3          64                                                 answer/antwoord
                m    3
                     4           3                                                                               (2)
                 m 4
 6.2          f ( x) log 4 x
                                                                                interchanging x and y
                 f 1 :x              log 4 y                                    omruiling van x en y

             y       4x                                                         answer / antwoord
                                                                                                                 (2)
 6.3
                                                           𝑓 −1
                                                                                y-intercept/y-afsnit

                                                   1                            shape and asymptote
                                                                                vorm en asimptoot

                                                                                                                 (2)
 6.4         y           2                                                      answer/antwoord
                                                   OR/OF                                 OR/OF
             y ( 2; )                                                           answer/antwoord
                                                                                                                 (1)
                                                                                                                 [7]

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### Page 12

12                                  MATHEMATICS P1/WISKUNDE V1                                           (EC/SEPTEMBER 2019)

                                         No penalty for rounding off in this question.
 QUESTION 7/VRAAG 7                      Geen penalisering vir afronding in hierdie vraag nie.

 7.1     A       P(1 i) n
                                                                                         substitution into correct
         R 26 700         R 40 000(1 i ) 5                                               formula
                                                                                         vervanging in korrekte formule
                                                                                         simplification /
             26700
         5          1          i                                                         vereenvoudiging
             40 000
             0,0777   i
                                                                                         value for r / waarde van r
             r 7,77% p.a.                                                                                                  (3)
 7.2.1                      x[1 (1 i ) ]     n
                      P                                                                  i 0,12
                                                                                              115
                                                                                                  and/en n 180
                                 i
                                      115 180
                            x[1 (1 0,12  ) ]                                             substituting into correct
         R1 200 000                 0 ,115                                               formula
                                      12                                                 vervanging in korrekte formule
                   1 200 000( 0,12
                                 115
                                     )
             x             0 ,115 180
                  [1 (1 12 ) ]

                                                                                         answer/antwoord
                   R14 018,28                                                                                              (3)
 7.2.2                    x 1 (1 i )     n
                                           n
 (a)     Balance                       1 i                              Balans           𝑛 = 105 for / vir P and/en
                                i                                                        𝑛 = 5 for / vir A
                                             115 105
                          R14 018,28 1 (1 0,12  )                  0 ,115 5              substituting into correct P formula
                                         0 ,115
                                                              1      12                  vervanging in korrekte P formule
                                           12                                            substituting into correct A formula
                                                                                         vervanging in korrekte A formule

                                                  0 ,115 5
                          R925 435,98 1             12                                   𝑃(1 + 0,115
                                                                                                12
                                                                                                     )5
                          R970 637,89                                                    answer/antwoord
                                                                                                                           (5)

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### Page 13

(EC/SEPTEMBER 2019)                 MATHEMATICS P1/WISKUNDE V1                                                                  13

                                         OR/OF
                                                                                          𝑛 = 75 for both formulae /
         Outstanding Balance after 75 months:                                                    vir albei formules
                                                                                          substituting into correct F formula
             A Fv                                                                         vervanging in korrekte F formule
                                                                                 75       substituting into correct A formula
                                                             11,5%
                                       75
                                                14018.28 1                            1   vervanging in korrekte A formule
                        11,5%                                  12
             1200 000 1
                          12                             11.5%
                                                           12

             2 453828,34          1528392, 76
             R 925 435,58

         Outstanding Balance after 80 months :
                                 11,5%
                                            5
                                                                                          𝑃(1 + 0,115
                                                                                                 12
                                                                                                      )5
             925 435,58 1
                                   12
                                                                                          answer/antwoord
             R 970 637, 48
                                                                                                                            (5)
 7.2.2      x[1 (1 i ) ]     n

 (b)     P
                  i
                       R14 018, 28[1 (1                           0,115
                                                                   12     ) n]            P = R970 637,89
         R970 637,89              0,115                                                   substituting into correct formula
                                                    12
                                                                                          vervanging in korrekte formule
         970 637,89( 0,115
                      12 )
                           1             (1         0,115
                                                     12     ) n
            14 018, 28
           0,3364416715              2423 )
                                   ( 2400
                                                n

                  log 0, 3364416715                                                       correct use of logs /
              n
                       log 2423
                                                                                          korrekte gebruik van logs
                           2400
                    114, 2130673                                                          final answer/finale antwoord
                                                                                                                            (4)
             n 115 months/maande
                                                                                                                           [15]

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### Page 14

14                                                       MATHEMATICS P1/WISKUNDE V1                                           (EC/SEPTEMBER 2019)

 QUESTION 8/VRAAG 8                                                Penalise once for notation in this question
                                                                   Penaliseer een keer vir notasie in hierdie vraag
 8.1          f ( x) 3 2 x 2
              f ( x h) 3 2( x h) 2
                                     3 2( x 2                2hx h 2 )
                                                                                                          3 2 x 2 4hx 2h2
                                                     2                2
                                     3 2x                    4hx 2h
                                         𝑓(𝑥+ℎ)−𝑓(𝑥)
              f ' ( x) lim
                                   ℎ→0        ℎ                                                          substitution / vervanging
                                         3−2𝑥 2 −4ℎ𝑥−2ℎ2 −(3−2𝑥 2 )
                           = lim
                                   ℎ→0                  ℎ                                                simplification / vereenvoudiging
                                             3−2𝑥 2 −4ℎ𝑥−2ℎ2 −3+2𝑥 2
                           = lim                                                                         factorisation / faktorisering
                                   ℎ→0                         ℎ
                                             ℎ(−4𝑥−2ℎ)
                           = lim                                                                         answer / antwoord
                                   ℎ→0                   ℎ
                           = lim −4𝑥 − 2ℎ
                                   ℎ→0
                           = −4𝑥 + 2(0)
                           = −4𝑥
                                                                                                                                              (5)
 8.2.1            D x x( x 2)                    2

                  D x x( x 2 4 x 4)
                                                                                                          x3 4 x 2 4 x
                               3             2
                  Dx x               4x              4x                                                  3𝑥 2           −8𝑥   +4
                       2                                                                                                                      (4)
                  3x    8x 4
 8.2.2                3   2x
              y    ax 7       3
                            x
                      3   2x
              y    ax 7       3                                                                                 1
                           1
                          x2                                                                             −2𝑥 2
                           3             1
                   ax 7             2x 2             3                                                   3          4         1
                                                                                                           𝑎𝑥 −7    −𝑥 −2
                                                                                                         7
                                                                                                      (derivative of constant must be
              dy           3    4                    1
                                                                                                       zero to get 3rd mark)
                             ax 7                x 2
              dx           7                                                                          (afgeleide van die konstante moet
                                                                                                       nul wees om 3de punt te kry)
                                                                                                                                       (3)
                                                                                                                                      [12]

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### Page 15

(EC/SEPTEMBER 2019)                                   MATHEMATICS P1/WISKUNDE V1                                      15

 QUESTION 9/VRAAG 9

 9.1         x               1
                             3    and/en x 1                                       x        1
                                                                                            3             x 1
                                                                                                                    (2)
 9.2         x (1 (                          1
                                                 )) 2
                                             3
                         1                                                             answer/antwoord
                         3
                                                                                                                    (2)
 9.3         g ( x) is increasing when g ( x) 0
             g ( x) is stygend wanneer g ( x) 0

                 1                                               1
                             x 1 OR / OF x                         ;1                  answer (accuracy)
                 3                                               3                     antwoord (akkuraatheid)
                                                                                                                    (2)
 9.4         y       a( x            x1 )( x          x2 )
                     a( x            1
                                     3   )( x 1)
                 1 a (0                  1
                                             )(0 1)                                substituting all intercepts
                                         3
                                                                                   vervanging van alle afsnitte
                 1           1
                             3   a                                                 a     3
                 a            3

                                                                                   y        3( x     1
                                                                                                        )( x 1)
                     y            3( x           1
                                                 3   )( x 1)                                         3
                                                                                                     2
                                                                                   g ( x)          3x      2x 1
                                             2        2   1
                                  3 x                   x
                                                      3   3
             g' x                 3x 2               2x 1

                                                             OR/OF
             y       a( x            x1 )( x          x2 )
                     a (3 x 1)( x 1)
                 1 a (3(0) 1)(0 1)                                                 substituting all intercepts
                 1   a                                                             vervanging van alle afsnitte
                                                                                   a     1
                 a           1
                                                                                   y        (3x 1)( x 1)
                     y            1(3 x 1)( x 1)                                   g ( x)          3x 2    2x 1
                                             2
                                     3x              2x 1
             g' x                 3x 2           2x 1
                                                                                                                    (4)

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### Page 16

16                                     MATHEMATICS P1/WISKUNDE V1                   (EC/SEPTEMBER 2019)

 9.5         g ( x)   ax 3    bx 2         cx d
             g' x     3ax 2           2bx c                          g ' x 3ax 2 2bx c
                       3x 2       2x 1                              3a       3
               3a      3      2b       2      c 1                   2b 2
                                                                    a      1 ; b 1; c 1
               a      1       b 1
                          3
                                                                    substitute (0 ; 0) into g ( x) 1
                y     x       x2       x d 1
                                                                    vervanging van (0 ; 0) in
                          3       2
                0     0       0        0 d 1                         g ( x) 1
               d      1                                                                             (5)
                                                                                                   [15]

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### Page 17

(EC/SEPTEMBER 2019)                      MATHEMATICS P1/WISKUNDE V1                                          17

QUESTION 10/VRAAG 10

 10.1        Let the two numbers be x and y
             Laat die twee getalle x en y wees :
             x y 18
                                                                           x       y   18
                 y       18       x
                                                                               2
                                                                           yx
             Product/Produk :P( x)                    yx 2
                                                                          substitution and simplification
                                         18    x x2                       vervanging en vereenvoudiging
                            18 x 2 x 3
             Product is maximum when: P '( x) 0
             Produk is ' n maksimum wanneer : P '( x )              0
                                                                           P ' ( x) and equating to 0
                              P '( x)     36 x 3 x 2
                                                                           P (x) en gelykstel aan 0
                              36 x 3 x 2       0
                              3 x(12 x) 0
                                x 0 or x 12                               x-values/waardes
                                                                          y-values/waardes
                          y 18 0 18
                      or/of y 18 12 6                                      selection of the 2 numbers
             P is maximum when x 12                                        keuse van die 2 getalle
             P is ' n maksimum wanneer x                      12
                                                                        (if/as x = 0, Product/Produk = 0)
                                  the two numbers are :12 and 6
                                  die twee getalle is :12 en 6
                            OR / OF
             Let the two numbers be x and y
             Laat die twee getalle x en y wees
             x       y    18                                               x       y   18
                                                                               2
                 y       18       x                                       xy
                                                                          substitution and simplification
             Product/Produk : P( x )                  xy 2                vervanging en vereenvoudiging
                                        x(18   x) 2
                                        x(324 36 x           x2 )
                                        324 x 36 x 2         x3
             Product is maximum when: P'(x) 0
             Produk is ' n maksimum wanneer : P '( x )              0
                          P '( x) 324 72 x 3 x 2
                          3x 2        72 x 324         0                  P ' ( x) and equating to 0
                          x   2
                                      24 x 108        0                   P (x) en gelykstel aan 0
                    ( x 18)( x 6) 0
                           x 18 or x 6
                                                                          x-values/waardes
                        y 18 18 0
              or/of        y 18 6 12                                      y-values/waardes
                                                                          selection of the two numbers
               The two numbers are 12 and 6
               Die twee getalle is 12 en 6                                keuse van die 2 getalle
                                                                         (P = 0 when/wanneer x = 18)
                                                                                                      [7]

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### Page 18

18                               MATHEMATICS P1/WISKUNDE V1                               (EC/SEPTEMBER 2019)

QUESTION 11 /VRAAG 11

11.1.1       a 111                                                       answer/antwoord
             b 106                                                       answer/antwoord
                                                                                                           (2)
11.1.2       P(a boy who plays cricket) / P(’n seun wat krieket speel)
(a)            108         54                                            numerator/teller
                   or / of
               530         265                                           denominator/noemer
                                                                                                           (2)
11.1.2         P(A or / of B)       P(A)     P(B) P(A and/en B)          formula/formule
(b)            P(girl or not a tennis player) /
               P(meisie of nie ' n tennisspeler nie)
                  288 445 231
                                                                         substitution into correct formula
                  530 530 530                                            vervanging in korrekte formule
                  502                                                    answer / antwoord
                  530
                     251
             or / of
                     265
             or / of 94,72%

                                      OR/OF
             P(Girl or not Tennis )
                                                                         method/metode
               1 P( Boy and Tennis )
                     28                                                  substitution/vervanging
               1
                   530
                                                                         answer/antwoord
               502
               530
                      251
             or / of
                      265
             or / of 94,72%                                                                                (3)

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### Page 19

(EC/SEPTEMBER 2019)             MATHEMATICS P1/WISKUNDE V1                                                           19

11.2.1       99 or / of 387 420 489                                  99                                            (1)
11.2.2       If vowels are together/As die vokale saam is:
               6! 4!                                               6! × 4!
               If vowels are not all together:                     subtracting from 9!
               As die vokale nie almal saam is nie :               aftrekking vanaf 9!
               9!     (6! 4!)                                      answer/antwoord
                                                                                                                   (3)

               345600
11.2.3       Vowels in odd spaces / Vokale in onewe spasies
              4 5 3 4 2 3 1 2
              (4 3 2 1) (5 4 3 2)                                  4!        × 120
              4! 120
              2880                                                Vowelsin odd spaces       Vokalein onewe spasies
                                                                                        /
                                                       2880       (9 8 7 6 5 4 3 2)           (9 8 7 6 5 4 3 2)
               Probability / Waarskynlikheid
                                              (9 8 7 6 5 4 3 2)
                                                  2880             answer/antwoord
                                                 362880
                                                                                                                   (4)
                                                  1
                                                                                                                  [15]
                                                 126

                                                                          TOTAL/TOTAAL:                           150

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