# Mathematics Grade 12 Paper 1 NSC June 2019 Memo

> Grade 12 Mathematics Paper 1 memorandum from the NSC June Exam 2019, 15 pages. Read online or get the free PDF download, question paper linked when available.

- Page: https://www.hlayiso.com/library/mathematics-p1-may-june-2019-memo-afr-eng/092f2ef3-6869-4148-9f47-3eb753cea5cb
- Updated: 2026-09-27
- Subject: Mathematics
- Grade: Grade 12
- Document type: Memorandum
- Year: 2019
- Exam period: NSC June Exam
- Paper: 1
- Curriculum: CAPS
- Pages: 15

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Mathematics · Grade 12 · NSC June Exam · 2019. Memorandum, 15 pages. Read online or download the PDF.

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### Page 1

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            SENIOR CERTIFICATE EXAMINATIONS/
                SENIORSERTIFIKAAT-EKSAMEN
        NATIONAL SENIOR CERTIFICATE EXAMINATIONS/
           NASIONALE SENIORSERTIFIKAAT-EKSAMEN

                                        MATHEMATICS P1/
                                          WISKUNDE V1

                         MARKING GUIDELINES/NASIENRIGLYNE

                                                  2019

                                                                                       MARKS: 150
                                                                                       PUNTE: 150

                            These marking guidelines consist of 15 pages.
                             Hierdie nasienriglyne bestaan uit 15 bladsye.

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Mathematics P1/Wiskunde V1                              2                                                DBE/2019
                                 SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

NOTE:
•  If a candidate answers a question TWICE, only mark the FIRST attempt.
•  Consistent Accuracy applies in all aspects of the marking memorandum.
LET WEL:
•   Indien ’n kandidaat ’n vraag TWEE keer beantwoord, merk slegs die EERSTE poging.
•   Volgehoue akkuraatheid is DEURGAANS op ALLE aspekte van die memorandum van
    toepassing.
QUESTION/VRAAG 1
1.1.1    x 2 − 5x − 6 = 0
         ( x − 6)( x + 1) = 0
         x = 6 or x = –1                                                     factors
                                                                             both answers
                                                                                                                (2)
         OR/OF                                                              OR/OF

         x 2 − 5x − 6 = 0
                                                                             correct subst into correct
            5 ± (−5) 2 − 4(1)(−6)                                             formula
         x=
                   2(1)
              5 ± 49
         x=
                 2
         x = 6 or x = –1                                                     both answers
                                                                                                                (2)
1.1.2    (3x − 1)(x − 4) = 16
                                                                             standard form
         3 x 2 − 13 x − 12 = 0
            13 ± (−13) 2 − 4(3)(−12)                                         correct subst into correct
         x=
                     2(3)                                                     formula
              13 ± 313
         x=
                  6
         x = 5,12 or x = −0,78
                                                                              answers
                                                                                                                (4)
         OR/OF                                                              OR/OF

                3 x 2 − 13 x − 12 = 0                                        standard form
                             13
                        x2 − x = 4
                              3
                                                                                                   2
             13    13 
                                 2
                              13 
                                                2
                                                                                      13 
         x2 − x + −  = 4 + −                                             adding  −  both
              3    6        6                                                     6
                                 2                                            sides
                      13  313
                     x−  =
                         6     36
                                 13 ± 313
                             x=
                                      6
                 x = 5,12 or x = −0,78
                                                                              answers                         (4)
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Mathematics P1/Wiskunde V1                                   3                                                DBE/2019
                                      SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

1.1.3    x(4 − x ) ≥ 0                                                            factorisation
         − x( x − 4 ) ≥ 0                          or   − x(x − 4 ) ≥ 0
         x( x − 4 ) ≤ 0

                                                             0    4
                    0            4

         0≤ x≤4             or       x ∈ [0 ; 4]                                  0 ≤ x ≤ 4
                                                                                                                     (3)
1.1.4      5 −12x
                    =4
            5x + 1
                                                                                  factors in numerator
           (5 x + 1)(5 x − 1)
                              =4
                5x + 1
         5x −1 = 4                                                                5x −1 = 4
         5x = 5
         x =1                                                                     answer
                                                                                                                     (3)
         OR/OF                                                                   OR/OF

         52x − 1
                   =4
         5x + 1
         5 2 x − 1 = 4.5 x + 4
         5 2 x − 4.5 x − 5 = 0                                                    standard form
         (5 − 5)(5 + 1) = 0
           x            x
                                                                                  factors
         5 x = 5 or 5 x ≠ −1
         x =1                                                                     answer
                                                                                                                     (3)
1.2      x = 2 − 3 y ………………………..……..(1)                                           x = 2 − 3y
           2
         x + 4 xy − 5 = 0 ………………………(2)
         Substitute (1) in (2):
              (2 − 3 y ) 2 + 4 y (2 − 3 y ) − 5 = 0                               correct subst into correct
         4 − 12 y + 9 y 2 + 8 y − 12 y 2 − 5 = 0                                   formula
                               − 3y 2 − 4 y −1 = 0
                                       3y2 + 4 y +1 = 0                           either standard form
                                     (3 y + 1)( y + 1) = 0
                                            1
                                     y = − or y = −1                              y – values
                                            3
                                          x = 3 or x = 5                          x – values
                                                                                                                     (5)

         OR/OF
                                                                                 OR/OF

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Mathematics P1/Wiskunde V1                          4                                                DBE/2019
                             SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

              2 x                                                                 2 x
         y=      − ………………………..……..(1)                                    y=       −
              3 3                                                                 3 3
         x 2 + 4 xy − 5 = 0 ………………………(2)
         Substitute (1) in (2):
                   2 x                                                 correct subst into correct
         x 2 + 4 x −  − 5 = 0
                   3 3                                                  formula
         3x + 8 x − 4 x 2 − 15 = 0
             2

         − x 2 + 8 x − 15 = 0
                                                                         either standard form
         x 2 − 8 x + 15 = 0
         ( x − 5)( x − 3) = 0
         x = 3 or x = 5                                                  x – values
              1
         y=−     or y = −1                                               y – values                       (5)
              3
1.3      ab = 2 10
         bc = 3 2
         ac = 6 5                                                        volume = abc
         ab.bc.ac = 2 10 .6 5.3 2                                        ab.bc.ac = 2 10 .6 5.3 2
                                                                         (abc )2 = 36 100
           (abc ) = 36 100
                  2

              abc = 360 = 6 10                                           answer
                                                                                                            (5)
         OR/OF                                                          OR/OF
                        6 5                                                  6 5
         ac = 6 5 ∴ a =                                                  a=
                         c                                                    c
                        3 2                                                  3 2
         bc = 3 2 ∴ b =                                                  b=
                         c                                                    c
         ab = 2 10

          6 5  3 2 
                   
          c  c  = 2 10
                   
         18 10 = 2 10 .c 2
         c2 = 9
                                                                         value of c
         c=3                                                             Volume = abc
         Volume = abc = 2 10 .3 = 360 = 6 10                             answer                            (5)
                                                                                                           [22]

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Mathematics P1/Wiskunde V1                                  5                                                  DBE/2019
                                     SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

QUESTION/VRAAG 2

2.1.1    59                                                                         answer
                                                                                                                    (1)
2.1.2     15                29                 41        51

                  14                      12        10

                            –2                 –2

                        2a = −2                                                    second difference of – 2
                         a = −1                                                    a
                3(− 1) + b = 14
                         b = 17
                                                                                   b
         (− 1) + (17 ) + c = 15
                         c = −1                                                    c
                        Tn = −n 2 + 17n − 1                                                                         (4)
2.1.3    T27 = −(27 ) + 17(27 ) − 1                                                 substitution
                        2

                                                                                    answer
               = −271                                                                                               (2)
2.2.1          − 18    1
         r=         =−                                                              answer
                36     2
                                                                                                                    (1)
2.2.2                       n −1
                                                                                             1
                                                                                                        n −1
                 1                                                                Tn = 36 − 
         Tn = 36 − 
                 2                                                                         2
                                   n −1
          9        1
              = 36 − 
         4096      2
                              n −1                                                                        n −1
           1     1                                                                   1     1
              = −                                                                      = − 
         16384  2                                                                  16384  2 
                 14                n −1
          1        1
         −  = − 
          2        2
         14 = n − 1                                                                 answer
         n = 15                                                                                                     (3)

         OR/OF                                                                     OR/OF

                       −9 9 −9               9
         36 ; − 18 ; 9 ;   ; ;      ; ... ;
                        2 4 8               4096
         If you look only at the denominator: 2 ; 4 ; 8 ; … ; 4096
         2 k = 4096                                                                 2 k = 4096
         2 k = 212
         k = 12                                                                     k = 12
         ∴ n = 15 terms                                                             answer
                                                                                                                    (3)

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Mathematics P1/Wiskunde V1                           6                                                DBE/2019
                              SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

2.2.3           a
         S∞ =
               1− r
                  36                                                         correct subst into correct
             =                                                                formula with – 1 < r < 1
                   1
               1− − 
                   2
             = 24                                                            answer if – 1 < r < 1
                                                                                                             (2)
2.2.4                            250
                             1      
                       − 18   − 1                                                 1
                             4                                           r=        and n = 250
         S 250 even =                                                               4
                               1
                                  −1
                               4
                    = −24                                                    S 250 even = −24
                          1  250 
                     36   − 1
                         4        
         S 250 odd =                
                            1
                              −1
                            4                                                S 250 odd = 48
                   = 48
         S odd      48
                 =
         S even − 24
                 = −2                                                        answer
                                                                                                             (4)
         OR/OF                                                              OR/OF
         T1 + T3 + T5 + T7 + ... + T499
         T2 + T4 + T6 + T8 + ... + T500
           a + ar 2 + ar 4 + ... + ar 498                                    a + ar 2 + ar 4 + ... + ar 498
         =
           ar + ar 3 + ar 5 + ... + ar 499                                   ar + ar 3 + ar 5 + ... + ar 499
             a + ar 2 + ar 4 + ... + ar 498
         =
             (
           r a + ar 2 + ar 4 + ... + ar 498   )                             
                                                                                 (
                                                                            r a + ar 2 + ar 4 + ... + ar 498     )
           1
         =
           r
         = −2                                                                answer                       (4)

                                                                                                            [17]

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Mathematics P1/Wiskunde V1                           7                                                DBE/2019
                              SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

QUESTION/VRAAG 3
3.1.1    p + 6 – (2p + 3) = p – 2 – (p + 6)                                   equating i.t.o p
                  –p+3=–8                                                     simplifying
                        p = 11                                                                               (2)
3.1.2    Tn = 25 + (n − 1)(−8) = 33 − 8n                                      subst into T n formula

         33 − 8n < −55
           − 8n < −88
                                                                              n > 11
               n > 11
                                                                              n = 12
         ∴ Term 12 will be the first term smaller than –55
                                                                                                             (3)
         ∴ Term 12 sal die eerste term kleiner as – 55 wees.
3.2           n           6
         S 6 = [a + l ] = [( x − 3) + ( x − 18)]
              2           2
                       = 6 x − 63                                             6 x − 63
              n           9
         S 9 = [a + l ] = [( x − 3) + ( x − 27)]
              2           2
                       = 9 x − 135                                            9 x − 135
         6 x − 63 = 9 x − 135
               3 x = 72
                                                                              24
                 x = 24
                   n          15                                               15
         ∴ S15 = [a + l ] = [( x − 3) + ( x − 45)]                            [( x − 3) + ( x − 45)]
                   2           2                                                2
                                15
                             = [2 x − 48]
                                 2
                                15                                            substitution of x
                             = [2(24) − 48] = 0 = RHS
                                 2                                                                           (5)
         OR/OF                                                               OR/OF
           9

         ∑ (x − 3k ) = 0
         k =7
                                                                              expansion
         (x − 21) + (x − 24) + (x − 27 ) = 0
                                                                              3 x − 72 = 0
         ∴ 3x − 72 = 0
                3x = 72
                                                                              24
                 x = 24
          15

         ∑ (24 − 3k )
          k =1

         = 21 + 18 + 15 + ..... + −21.                                        substitution of x
               n
         S n = [a + l )]
               2
              15                                                              sum of 15 terms
             = [21 − 21]
               2                                                                                             (5)
             = 0 = RHS

         OR/OF                                                               OR/OF

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Mathematics P1/Wiskunde V1                              8                                                DBE/2019
                                 SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

         ( x − 3) + ( x − 6) + ( x − 9) + ( x − 12) + ( x − 15) + ( x − 18)      expansion
         = ( x − 3) + ( x − 6) + ( x − 9) + ( x − 12) + ( x − 15) + ( x − 18)
          + ( x − 21) + ( x − 24) + ( x − 27)
                                                                                 3 x − 72 = 0
         ∴ 3x − 72 = 0
                3x = 72
                 x = 24                                                          24

          15
          ∑ (24 − 3k )
         k =1
         = 21 + 18 + 15 + ..... + −21.                                           substitution of x
               n
         S n = [a + l ]
               2
              15
             = [21 − 21]
               2                                                                 sum of 15 terms               (5)
             = 0 = RHS                                                                                         [10]

QUESTION/VRAAG 4

4.1        y>0                                                                         answer
                                                                                                                      (1)
          OR/OF                                                                        OR/OF
          y ∈ (0 ; ∞ )                                                                 answer
                                                                                                                      (1)
4.2              1
                        x
          g: y =  
                 2
                            y
               −11                                                                        1
                                                                                                   y
           g :x =                                                                    x = 
                 2                                                                        2
                                                                         1              equation                     (2)
           y = log 1 x      or     y = − log 2 x      or     y = log 2
                    2
                                                                         x
4.3       Yes. The vertical line test cuts g–1 once                                     yes
          Ja. Die vertikale lyn toets sny g–1 slegs eenkeer.                            valid reason                 (2)

          OR/OF                                                                        OR/OF
          Yes. For every x-value there is a unique y-value                              yes
          Ja. Vir elke x-waarde is daar ‘n unieke y-waarde                              valid reason
                                                                                                                      (2)
          OR/OF                                                                        OR/OF
          Yes. g is a one-to-one function / Ja. g is ‘n een-tot-een funksie             yes
                                                                                        valid reason
                                                                                                                      (2)
          OR/OF                                                                        OR/OF
          Yes. The horizontal line cuts g only once                                     yes
          Ja. Die horisontale lyn sny g slegs een keer                                  valid reason
                                                                                                                      (2)

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Mathematics P1/Wiskunde V1                           9                                                DBE/2019
                              SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

4.4.1     y = − log 2 x
          2 = − log 2 a                                                              correct subst into correct
                                            2
                                                                                     formula (a ; 2)
                       1            1   1
          a = 2 −2 =         or   a=  =
                       4            2   4                                         answer                       (2)
4.4.2          1                                                                   answer
          M /  2 ;  or M / (2 ; a )                                                                             (1)
               4
4.5                 9                                                              −1
          M //  − 1;                                                                 9
                    4                                                             
                                                                                       4
                                                                                                                  (3)
                                                                                                                 [11]

QUESTION/VRAAG 5
5.1.1      x = −2                                                                                 answer
           y =3                                                                                   answer
                                                                                                                       (2)
5.1.2       7
           0 ;                                                                                  answer
            2
                                                                                                                       (1)
5.1.3         1
                   +3= 0                                                                         y=0
            x+2
           1 + 3( x + 2 ) = 0
           3 x = −7
                   7
           x=−                                                                                    answer
                   3
                                                                                                                       (2)
                            7 
           x-intercept  − ; 0 
                            3 
5.1.4

                                                     y

                                                                                                 asymptotes at
                                                                                                   y = 3 and
                                                     3,5
                                                                                                   x=–2
                                                                                                 intercepts at
                                                         3                                         y = 3,5 and
                                                                                                   x = – 2,3
                                                                                                 shape
                                    –2,3                                              x          (reasonable
                                    – 2,3       –2           0                                   representation in
                                                                                                 correct quadrants)
                                                                                                                (3)

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Mathematics P1/Wiskunde V1                           10                                                DBE/2019
                               SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

5.2.1      − 2x + 4 = 0                                                                y=0
                 2x = 4
                   x=2                                                                 x=2
           ∴ S(2 ; 0)
                                                                                                                  (2)
5.2.2      Equation of k:
           y = a(x + 1) + 18                                                            y = a( x + 1) + 18
                       2                                                                                2

            0 = a(2 + 1) + 18
                         2
                                        or       0 = a(− 4 + 1)2 + 18                   substitute (2 ; 0) or
                                                                                         (– 4 ; 0)
           9a = −18
            a = −2                                                                     a
            y = −2(x + 1) + 18
                         2
                                                                                                                  (3)
5.2.3           2
           − 2 x − 4 x + 16 = −2 x + 4                                                  equating
           − 2 x 2 − 2 x + 12 = 0
                   x2 + x − 6 = 0                                                       standard form
              (x + 3)(x − 2) = 0                                                        factors
                             x = −3 or x = 2
                                                                                        choosing x = –3
           y = −2(−3) + 4 = 10                                                          answer
           T(–3 ; 10)                                                                                             (5)
5.2.4      x < −3 or x > 2                                                              answer
                                                                                                                  (2)
           OR/OF                                                                       OR/OF
           (−∞ ; − 3) ∪ (2 ; ∞)                                                         answer
                                                                                                                  (2)
5.2.5(a)   x < −1                                                                       answer
                                                                                                                  (2)
           OR/OF                                                                       OR/OF
           (−∞ ; − 1)                                                                   answer
                                                                                                                  (2)
5.2.5(b)
                                             y                                          shape of cubic with
                                                                                         local min tp moving to
                                                                                         local max tp

                                                              g                         turning points at x = 2
                                                                                         and x = –4

                    –4                                                  x               point of inflection at
                                   –1        0      2                                    x = –1
                                                                                                              (3)

                                                                                                                 [25]

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Mathematics P1/Wiskunde V1                            11                                                DBE/2019
                                SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

QUESTION/VRAAG 6

6.1.1                 A = P(1 − i )
                                        n

            79866,96 = 180 000(1 − 0,15)n                                   substitution
         (1 − 0,15)n = 79866,96
                       180 000
                               79866,96 
                          log                                            use of logs
                               180 000 
                      n=
                            log(1 − 0,15)
                      n = 4,999… years
                      n ≈ 5 years                                           answer
                                                                                                               (3)
6.1.2                 A = P(1 + i )
                                        n

                                            20                              values of i and n
                             0,1                                          substitution
                    = 49 0001 + 
                                4 
                   = R80 292,21
         The money will be enough to buy the car.                           conclusion
         Die geld sal genoeg wees om die motor te koop.                      (consistent with answer)
                                                                                                               (3)
6.2.1
            P=
                  [
                x 1 − (1 + i )
                               −n
                                    ]
                       i
                                                                                              0,1025
                            0,1025  −234                                n = 234  i =
                7853,151 − 1 +                                                              12
                                   12                                 substitution in present
            P=
                               0,1025                                        value formula
                                 12
            P = R793 749,25                                                 answer
                                                                                                               (4)
         OR/OF                                                             OR/OF

         Balance Outstanding / Uitstaande balans
                                           0,1025  6                    n = 6 in both
                                   7853,151 +       − 1                      0,1025
                      0 ,1025 
                                 6
                                          
                                                12                     i=
         = 800 0001 +          −                                                 12
                          12               0,1025                        A–F
                                               12
         = 841 885,56 − 48 136,62
         = R793 748,94                                                      R793 748,94
                                                                                                               (4)

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Mathematics P1/Wiskunde V1                                12                                                DBE/2019
                                    SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

6.2.2    A = P(1 + i )
                        n

                                                3
                        0,1025                                                                                3
            = 793749,251 +                                                               0,1025 
                           12                                                 793749,251 +     
                                                                                              12 
            = R814 263,3052

         New instalment/Nuwe paaiement:

          P=
                    [
              x 1 − (1 + i )
                            −n
                                ]
                     i
                                 0,1025  − 231                              n = 231
                             x 1 − 1 +         
                                         12                                 substitution of new P
         814 263,3052 =                          
                                        0,1025                                  substitution of n and i into
                                          12                                     formula
                     x = R8 089,20                                              answer                   (5)
                                                                                                         [15]

QUESTION/VRAAG 7

7.1       f ( x) = x 2 + 2
          f ( x + h) = ( x + h ) + 2
                                2

                     = x 2 + 2 xh + h 2 + 2
                                                          (
          f ( x + h) − f (x ) = x 2 + 2 xh + h 2 + 2 − x 2 + 2   )         x 2 + 2 xh + h 2 + 2
                                 = 2 xh + h 2
                                         f (x + h ) − f (x )
                        f / ( x) = lim
                                   h →0          h
                                         2 xh + h 2                                2 xh + h 2
                                 = lim                                     lim
                                    h →0      h                               h →0     h
                                       h(2 x + h )                                   h(2 x + h )
                                = lim                                      lim
                                  h →0     h                                  h →0       h
                                = lim(2 x + h )
                                     h →0

                                    = 2x                                   answer
                                                                                                                    (4)
                                                                          OR/OF
         OR/OF
                         f (x + h ) − f (x )
          f / ( x) = lim
                    h →0          h
         = lim
                x + 2 xh + h + 2 − x 2 + 2
                  2             2
                                            (       )                      x 2 + 2 xh + h 2 + 2
           h→0                  h
                          2
                2 xh + h                                                         2 xh + h 2
         = lim                                                             lim
           h →0       h                                                     h →0     h
                h(2 x + h )                                                      h(2 x + h )
         = lim                                                             lim
           h →0     h                                                       h →0      h
          = lim(2 x + h )
             h →0

          = 2x                                                             answer                                  (4)

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Mathematics P1/Wiskunde V1                                 13                                                  DBE/2019
                                     SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

7.2.1    y = 4 x 3 + 2 x −1                                                 + 2 x −1
         dy
            = 12 x 2 − 2 x − 2                                              12x 2
         dx
                                                                            − 2 x −2
                                                                                                                      (3)
7.2.2    y = 4 x + (3 x )
               3               3 2
                                                                                 1
                   1                                                                            6
           = 4x + 9x
                   3       6                                                4x 3  9x

                                                                                     2
         dy 4 − 3
                       2                                                    4 −        5
           = x + 54 x5                                                      x 3  54x
         dx 3                                                               3
                                                                                                                      (4)
7.3      Point of contact:              (1 ; 5)
         m=2                                                                m=2
         y − y1 = m( x − x1 )           or    y = 2x + c                    substitution of (1 ; 5)
         y − 5 = 2( x − 1)                    5= 2+c
                                              c=3
         y = 2x + 3                           y = 2x + 3                    answer
                                                                                                                      (3)
                                                                                                                     [14]

QUESTION/VRAAG 8
8.1                     3                                                                           3
         h( x) = −2( x + )( x − 1)( x + 3)                                               – 2 ( x + )( x − 1)( x + 3)
                        2                                                                           2
                                 (
         h(x ) = −(2 x + 3) x 2 + 2 x − 3    )                                           correct simplification
                                                                                                                   (3)
         h(x ) = −2 x 3 − 7 x 2 + 9
                                                                                         OR/OF
         OR/OF
         h( x) = −(2 x + 3)( x − 1)( x + 3)                                               − (2 x + 3)( x − 1)( x + 3)
                                 (
         h(x ) = −(2 x + 3) x 2 + 2 x − 3     )                                           correct simplification
                                                                                                                     (3)
         h(x ) = −2 x 3 − 7 x 2 + 9

8.2      h / ( x) = −6 x 2 − 14 x
                                                                                          first derivative
         − 6 x 2 − 14 x = 0
                                                                                         =0
         − 2 x(3x + 7 ) = 0
                            7
         x = 0 or x = −                                                                   both answers
                            3
                                                                                                                      (3)
8.3             7                                                                         answer
         x<−      or x > 0
                3                                                                                                     (2)
         OR/OF                                                                           OR/OF
                     7
         x ∈  − ∞ ; −  ∪ ( 0 ; ∞)                                                       answer
                     3
                                                                                                                      (2)

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Mathematics P1/Wiskunde V1                                   14                                                DBE/2019
                                       SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

8.4       y = 4x + 7                                                                   y = 4x + 7
               2
         − 6 x − 14 x = 4                                                              h / (x ) = 4
         0 = 6 x 2 + 14 x + 4
                                                                                       standard form
         0 = 3x 2 + 7 x + 2
         0 = (3 x + 1)( x + 2 )
                   1                                                                   both answers
         x=−         or x = −2
                   3                                                                                                   (4)
                                                                                                                      [12]

QUESTION/VRAAG 9

9.1      Volume of Sphere
           4                2048π
         = π (8)3   or    =                          or   = 2144,66
           3                  3                                                        answer
                                                                                                                       (1)
9.2        2
         r +x =8   2        2
                                    (Pythagoras)                                       substitution or reason
         r 2 = 64 − x 2                                                                 Pythagoras
                                                                                                                       (1)
9.3               1
           Vcone = πr 2 h
                  3
                                                                                      h=8+x
                  1
                                (
                 = π 64 − x 2 (8 + x )
                  3
                                         )                                              1
                                                                                                 (       )
                                                                                       π 64 − x 2 (8 + x )
                                                                                        3
                       =
                           π
                           3
                             (512 + 64 x − 8x − x )
                                                 2   3
                                                                                       expansion

               dV 64π 16π    3π 2
                  =   −   x−    x                                                      dV = 64π − 16π x − 3π x 2
               dx   3   3     3                                                             dx       3    3       3
                                             2
               0 = 64 − 16 x − 3 x
               0 = (8 − 3 x )( x + 8)
                   8                                                                             8
                x=           x ≠ −8                                                   x=
                   3                                                                             3
                    1  512  32 
                     π          
          Vcone     3  9  3                                                        volume of the cone
                 =
         Vsphere        2048π
                             3
                    8
                 =     = 0,3                                                                8
                   27                                                                         or 0,3
                                                                                            27
                                                                                                                       (7)
                                                                                                                       [9]

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Mathematics P1/Wiskunde V1                          15                                          DBE/2019
                              SC/SS/NSC/NSS – Marking Guidelines/Nasienriglyne

QUESTION/VRAAG 10
10.1

                                    R
                          R

                                    B

                                    R
                          B

                                    B

         P(One Red and One Blue)                                            3 2
         = P(Red, Blue) + P(Blue, Red)                                      × 
                                                                             12   11 
           3 2 2 3                                                  2 3
         =  ×  +  ×                                                 × 
            12   11   12   11                                        12   11 
            1                                                              addition of products
         =
           11                                                              answer
                                                                                                      (4)
10.2.1 a = 0,48 × 250
       a = 120                                                             answer                    (1)
10.2.2 b = 150                                                             b
       P(S) × P(F)
          200 150                                                          P(S) × P(F)
       =      ×
          250 250                                                           200     150
                                                                               and
       = 0,48                                                               250     250
       = P(S and F)
       These events are independent /                                      conclusion
       Hierdie gebeurtenisse is onafhanklik                                 (with realistic probabilities)
                                                                                                       (4)
                                                                                                       [9]

QUESTION/VRAAG 11
11.1   10 × 9                                                                 10 × 9
       = 90                                                                                           (2)
11.2.1 10!                                                                    10!
       =3 628 800                                                                                     (1)
11.2.2 2! × 2! × 2! × 2! × 2! ×4!                                             2! × 2! × 2! × 2! × 2!
       = 768                                                                  4!
                                                                              2! × 2! × 2! × 2! × 2!×4!
                                                                               or 768
                                                                                                      (3)
                                                                                                      [6]
                                                                                 TOTAL/TOTAAL: 150

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