# Mathematics Grade 12 Paper 1 Eastern Cape Mock 2017 Memo

> Grade 12 Mathematics Paper 1 memorandum from the Eastern Cape Mock Exam 2017, 13 pages. Read online or download the free PDF.

- Page: https://www.hlayiso.com/library/maths-p1-memo/99e7c7f2-73ec-4998-9704-ed5d451b1b9e
- Updated: 2026-09-27
- Subject: Mathematics
- Grade: Grade 12
- Document type: Memorandum
- Year: 2017
- Exam period: Eastern Cape Mock Exam
- Paper: 1
- Curriculum: CAPS
- Pages: 13

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### Page 1

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                          NATIONAL
                     SENIOR CERTIFICATE/
                          NASIONALE
                      SENIOR SERTIFIKAAT

                          GRADE/GRAAD 12

                        SEPTEMBER 2017

           MATHEMATICS P1/WISKUNDE V1
                MEMORANDUM

MARKS/PUNTE:   150

                 Hierdie memorandum bestaan uit 13 bladsye./
                   This memorandum consists of 13 pages.

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2                                 MATHEMATICS P1/WISKUNDE V1                         (EC/SEPTEMBER 2017)

NOTE/LET OP:

         If a candidate answered a question TWICE, mark the FIRST attempt ONLY.
          Indien ŉ kandidaat ŉ vraag TWEE keer beantwoord het, merk SLEGS die EERSTE poging.
         Consistent accuracy applies in ALL aspects of the memorandum.
          Volgehoue akkuraatheid geld deurgaans in ALLE aspekte van die memorandum.
         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 toegeken vir substitusie in die korrekte formule.

QUESTION 1/VRAAG 1

    1.1          2𝑥(𝑥 + 1) − 7(𝑥 + 1) = 0
                 (𝑥 + 1)(2𝑥 − 7) = 0                                  factors/faktore
                                        7                             𝑥-value/waarde
                 𝑥 = −1 or / 𝑜𝑓 𝑥 =
                                        2                             𝑥-value/waarde
                                                                                                    (3)

    1.2          𝑥 2 − 5𝑥 − 1 = 0
                      −𝑏 ± √𝑏 2 − 4𝑎𝑐
                 𝑥=                                                    substitution into correct
                            2𝑎
                                                                      formula/substitusie in korrekte
                      −(−5) ± √(−5)2 − 4(1)(−1)
                 𝑥=                                                   formule
                                  2(1)
                 𝑥 = 5,19 or 𝑥 = −0,19                                𝑥-values/waardes
                                                                                                    (3)

    1.3          4𝑥 2 + 1 ≥ 5𝑥
                 4𝑥 2 − 5𝑥 + 1 ≥ 0                                     standard form/standaard
                 (4𝑥 − 1)(𝑥 − 1) ≥ 0                                  vorm
                                                                       factors/faktore
                     +       -       +
                         1
                                 1                                          1
                         4                                            𝑥 ≤ 4
                     1                                                𝑥 ≥ 1
                 𝑥 ≤ 4 or/ of 𝑥 ≥ 1                                                                 (4)

    1.4          54𝑥+3 . 100−2𝑥+1 = 50 000
                 54𝑥+3 . (52 . 22 )−2𝑥+1 = 50 000
                 54𝑥+3 . 5−4𝑥+2 . 2−4𝑥+2 = 50 000                     5−4𝑥+2
                 55 . 2−4𝑥 . 22 = 50 000                              2−4𝑥+2
                 2−4𝑥 = 22                                            −4𝑥 = 2
                 −4𝑥 = 2
                         1                                             answer/antwoord
                 𝑥=−                                                                                (4)
                         2

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(EC/SEPTEMBER 2017)          MATHEMATICS P1/WISKUNDE V1                                             3

 1.5        𝑥 = 2𝑦 …………………..(1)
            𝑥 2 + 2𝑥 − 𝑦 − 𝑦 2 = 36……….(2)

            𝑥 = 2𝑦
            sub into (2)/vervang in (2)
            (2𝑦)2 + 2(2𝑦) − 𝑦 − 𝑦 2 = 36                         substitution/vervanging
            4𝑦 2 + 4𝑦 − 𝑦 − 𝑦 2 = 36
            3𝑦 2 + 3𝑦 − 36 = 0
            𝑦 2 + 𝑦 − 12 = 0                                     standard form/standaardvorm
            (𝑦 − 3)(𝑦 + 4) = 0                                   factors/ faktore
            𝑦 = 3 or 𝑦 = −4                                     y − values/ 𝑦 − 𝑤𝑎𝑎𝑟𝑑𝑒𝑠

            𝑥 = 6 or 𝑥 = −8                                     x − values/ 𝑥 − 𝑤𝑎𝑎𝑟𝑑𝑒𝑠
                                                                                                        (5)

 1.6        𝑥 2 − 𝑘𝑥 + 𝑘 − 1 = 0
            ∆ = 𝑏 2 − 4𝑎𝑐                                        substitution/vervanging
            ∆ = (−𝑘)2 − 4(1)(𝑘 − 1)                              simplification/vereenvoudiging
            ∆ = 𝑘 2 − 4𝑘 + 4                                    (𝑘 − 2)2
            ∆ = (𝑘 − 2)2                                         conclusion/gevolgtrekking
            ∆ ≥ 0 roots are real and rational(perfect square)                                   (4)

                                                                                                    [23]

QUESTION 2/VRAAG 2

 2.1.1      𝑇𝑛 = 4𝑛 − 1                                         𝑇𝑛 = 4𝑛 − 1
            483 = 4𝑛 − 1                                         equating/gelykstelling 483
            484 = 4𝑛                                             answer/antwoord
            𝑛 = 121
            121 terms in series/ 121terme in reeks                                             (3)

 2.1.2       121

            ∑(4𝑛 − 1)                                            answer/antwoord
            𝑛=1                                                                                (2)

 2.2.1      (𝑡 − 3) − (2𝑡 − 4) = (8 − 2𝑡) − (𝑡 − 3)              setting up equation/opstel van
            −𝑡 + 1 = −3𝑡 + 11                                    vergelyking
            2𝑡 = 10                                              simplification/vereenvoudig
            𝑡=5                                                  answer/antwoord
                                                                                             (3)

 2.2.2      … ; … ; … 6 ; 2 ; −2 ; … ; … ; …                     numerical values of
            𝑇10 = 6        or /of            𝑇𝑛 = −4𝑛 + 46      𝑇10 ; 𝑇11 ; 𝑇12 / numeriese waardes
            𝑎 + 9𝑑 = 6                       𝑇1 = −4(1) + 46    van 𝑇10 ; 𝑇11 ; 𝑇12
            𝑎 + 9(−4) = 6                    𝑇1 = 42             difference / verskil −4
            𝑎 = 42                                               a-value/a-waarde
                                                                                                (3)

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4                                    MATHEMATICS P1/WISKUNDE V1                                              (EC/SEPTEMBER 2017)

 2.3        𝑎𝑟 2 + 𝑎𝑟 3 = −4
            𝑎 + 𝑎𝑟 = −1                                                                        setting of equations/ opstel
                                                                                              van vergelykings
            𝑎𝑟 2 (1 + 𝑟) = −4
              𝑎(1 + 𝑟) = −1                                                                    common factor/gemene faktor
            ∴ 𝑟2 = 4
            ∴ 𝑟 = ±2                                                                          𝑟 = 2
            𝑎 + 𝑎(2) = −1
            ∴ 𝑎 + 2𝑎 = −1
            3𝑎 = −1                                                                            value of a/waarde van a
                    1
            𝑎=−                                                                                first three terms/eerste drie
                    3
                                                                                              terme ry
                                         1       2        4
            First three terms: − 3 ; − 3 ; − 3
            Eerste drie terme:                                                                                                 (6)

                                                                                                                           [17]

QUESTION 3/VRAAG 3

 3.1        41 ; 43 ; 47 ; 53 ; 61 ; 71 ; 83 ; 97 ; 113 ; 131

               2         4       6           8       10       12       14       16       18
                     2       2       2           2        2        2        2        2               2nd difference/ tweede
                                                                                                     verskil
            2𝑎 = 2               𝑎+𝑏 =2          𝑎 + 𝑏 + 𝑐 = 41                                     𝑎 = 1
            𝑎=1                     𝑏 = −1                 𝑐 = 41                                   𝑏 = −1
                                           2                                                        𝑐 = 41
                                   ∴ 𝑇𝑛 = 𝑛 − 𝑛 + 41
                                                                                                    𝑇𝑛 = 𝑛2 − 𝑛 + 41
                                                                                                                           (5)

 3.2        𝑇41 = 412 − 41 + 41                                                                     𝑇41 = 1681
            𝑇41 = 1681
                                                                                                    factors / faktore
            Factors of 1681: 1 ; 41 and 1681
            Faktore van 1681 : 1 ; 41 en 1681                                                       conclusion/
                                                                                                     gevolgtrekking
            1681 is not a prime number/ 1681 is nie ŉ priemgetal nie                                                            (3)

 3.3        Consider the unit digits only/kyk na die ene syfers
            alleenlik.

               1 ; 3 ; 7 ; 3 ;1 ;1 ; 3 ; 7 ; 3 ;1 ;                                                  unit digits/ene syfers

            groups of 5/ groepe van 5                                                                groups of 5/
            49999998                                                                                  groepe van 5
                        = 9999999,6                                                                  conclusion/
                 5
            0,6 × 5 = 3                                                                               gevolgtrekking
            𝑇49999998 will end in 7/ sal met ŉ 7 eindig                                                                     (3)
                                                                                                                           [11]

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(EC/SEPTEMBER 2017)            MATHEMATICS P1/WISKUNDE V1                                        5

QUESTION 4/VRAAG 4

 4.1.1      𝐴 = 𝑃(1 + 𝑖)𝑛
                             7,2 12𝑛                           sub into formula/ vervang in
            𝐴 = 500 000 (1 +      )                            formule
                            1200
            𝐴 = 500 000(1.006)12𝑛                             12𝑛
                                                                                           (2)

 4.1.2                 𝐴 = 500 000(1.006)12𝑛
            𝐴 = 500 000(1.006)12×5                            𝑛 = 60
            𝐴 = 𝑅 715894.21                                    answer/ antwoord
                                                                                            (2)

 4.1.3      𝐴 = 𝑃(1 + 𝑖)𝑛
            1000000 = 500000(1.006)12𝑛                         setting up equation/opstel van
                      log 2                                    vergelyking
            12𝑛 =                                             using logs/ gebruik van log
                    log 1.006
            12𝑛 = 115.8707581
            𝑛 = 9,66 𝑦𝑒𝑎𝑟𝑠
            Will exceed R1 000 000 in 10 years.               conclusion/gevolgtrekking
            Sal R1 000 000 oorskry in 10 jaar.                                              (3)

 4.2.1
                                                −36
                                         15                   𝑖 and/𝑒𝑛 𝑛
                     10 000 [1 − (1 + 1200)           ]
                                                              sub into 𝑃𝑣 formula/ vervang in
            𝑃𝑣 =                 15                           𝑃𝑣 formule
                                1200
            𝑃𝑣 = 𝑅288 472,67
                                                              𝑃𝑣 = 𝑅288 472,67
            𝑑𝑒𝑝𝑜𝑠𝑖𝑡/𝑜 = 𝑅350 000 − 𝑅288 472,67
            𝑑𝑒𝑝𝑜𝑠𝑖𝑡/𝑜 = 𝑅61 527,33
                                                              subtracting/𝑎𝑓𝑡𝑟𝑒𝑘𝑘𝑖𝑛𝑔
                                                               answer/antwoord
                                                                                            (5)

 4.2.2                                        18,5 −60              18,5
                                                              𝑖 = 1200
                            𝑥 [1 − (1 + 1200)             ]
            350 000 =                  18,5                   𝑛 = −60
                                       1200                    substitution/substitusie

            𝑥 = 𝑅 8 983,17                                     answer/antwoord

                                                                                            (4)

                                                                                           [16]

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6                           MATHEMATICS P1/WISKUNDE V1                 (EC/SEPTEMBER 2017)

QUESTION 5/VRAAG 5

 5.1        𝐴(−3; 0)                                      answer/antwoord
                                                                                      (1)

 5.2        𝑓(𝑥) = 𝑥 2 + 3𝑥
                    𝑏
            𝑥=−                                                  3
                   2𝑎                                    𝑥 = − 2
                   3
            𝑥=−
                   2
                 3        3 2   3
            𝑓 (− ) = (− ) + 3 (− )
                 2        2     2                        substitution/ vervanging
                         9
                     = −
                         4
                 3     9
            𝑃 (− ; − )                                    answer/ antwoord
                 2     4                                                              (3)

 5.3        𝑓(−5) = 10    and / en 𝑓(−3) = 0             calculating 𝑓(−5) and 𝑓(−3)
                                                         bepaling van𝑓(−5)𝑒𝑛 𝑓(−3)
                 10 − 0                                   substitution/substitusie
            𝑚=
                −5 − (−3)                                𝑚-value/waarde
            𝑚 = −5                                                                  (3)

 5.4        𝑥 < −3 or / of 𝑥 > 0                          answer/ antwoord
                                                                                      (2)

 5.5            3    9
            𝑃 (−  ;− )
                2    4
              3        9
            (− − 2 ; − )
              2        4
              1    9                                      answer/ antwoord
            (− ; − )
              2    4

            or/of

            𝑓(𝑥 − 2) = (𝑥 − 2)(𝑥 − 2 + 3)
            𝑓(𝑥 − 2) = 𝑥 2 − 𝑥 − 2                       𝑓(𝑥 − 2) = 𝑥 2 − 𝑥 − 2
                  (−1)
            𝑥=−
                  2(1)
                                                                 1
                  1                                      𝑥 = − 2
            𝑥=−
                  2                                                                   (2)

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(EC/SEPTEMBER 2017)          MATHEMATICS P1/WISKUNDE V1                                     7

 5.6               1
            𝐿𝑀 = − 𝑥 + 2 − (𝑥 2 + 3𝑥)
                   2                                      𝑔(𝑥) − 𝑓(𝑥)
                   1
            𝐿𝑀 = − 𝑥 + 2 − 𝑥 2 − 3𝑥
                   2                                       standard form/standaardvorm
                        7
            𝐿𝑀 = −𝑥 2 − 𝑥 + 2
                        2
                      2
                          7
            𝐿𝑀 = − (𝑥 + 𝑥 − 2)
                          2                               completing the square/
                          7 2 81                          voltooing van kwadraat
            𝐿𝑀 = − [(𝑥 + ) − ]
                          4    16
                        7   2
                              81                           answer/antwoord
            𝐿𝑀 = − (𝑥 + ) +
                        4     16

            OR/OF
                   1                                      𝑔(𝑥) − 𝑓(𝑥)
            𝐿𝑀 = − 𝑥 + 2 − (𝑥 2 + 3𝑥)
                   2
                   1                                       standard form/standaardvorm
            𝐿𝑀 = − 𝑥 + 2 − 𝑥 2 − 3𝑥
                   2
                       7
            𝐿𝑀 = −𝑥 2 − 𝑥 + 2
                       2                                             7
            𝑑𝐿𝑀          7                                 𝑥 = −4
                = −2𝑥 −
             𝑑𝑥          2
                 7
            −2𝑥 − = 0
                 2
                 7                                              81
            𝑥=−                                            𝑦 = 16
                 4

                    7 2 7    7
            𝑦 = − (− ) − (− ) + 2
                    4     2  4
                81
            𝑦=
                16
                         7 2 81
            ∴ 𝐿𝑀 = − (𝑥 + ) +
                         4    16

            OR/OF

                       𝑏                                  𝑔(𝑥) − 𝑓(𝑥)
            𝑥=−
                      2𝑎                                   standard form/standaardvorm
                         7
                        −2
            𝑥=−
                  2(−1)
                  7
            𝑥=−                                                      7
                  4                                        𝑥 = −4
                     7 2 7   7
            𝑦 = − (− ) − (− ) + 2
                     4    2  4
                81
            𝑦=
                16                                              81
                                                           𝑦 = 16
                         7 2 81
            ∴ 𝐿𝑀 = − (𝑥 + ) +
                         4    16
                                                                                       (4)
                                                                                     [15]

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8                             MATHEMATICS P1/WISKUNDE V1                     (EC/SEPTEMBER 2017)

QUESTION 6/VRAAG 6

 6.1                                  𝑦                      shape / vorm
                              ℎ                ℎ−1
                                                             y − intercept/ 𝑦 − 𝑎𝑓𝑠𝑛𝑖𝑡

                                                              point on graph/punt op
                                          1•             𝑥   grafiek
                                                •
                                               1

                                                                                            (3)

 6.2        𝑞(𝑥) = 2𝑥                                         answer/antwoord
                                                                                            (1)

 6.3                                ℎ−1 𝑥 = 2−𝑦
                     log 𝑥
            −𝑦 =                                              interchange 𝑥 and 𝑦
                     log 2
                     log 𝑥
            𝑦 = − log 2 / 𝑦 = − log 2 𝑥 /𝑦 = log 1 𝑥         ruil 𝑥 en 𝑦
                                                     2
                                                              equation/vergelyking
                                                                                            (2)

 6.4        𝑦 ≥ 0 ;𝑦 ∈ 𝑅                                                                    (1)

 6.5        See 7.2.1/ sien 7.2.1                            shape and x-intercept/vorm
                                                             en x-afsnit                (2)

 6.6        log 1 𝑥 = −3
               2
             1 −3
            ( ) =𝑥                                           𝑥 = 8
             2
            𝑥=8                                              0 < 𝑥 ≤ 8
            ∴ 0<𝑥≤8                                                                         (2)

                                                                                           [11]

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(EC/SEPTEMBER 2017)             MATHEMATICS P1/WISKUNDE V1                                        9

QUESTION 7/VRAAG 7

 7.1        𝑑=5                                              𝑑 = 5
            𝑝=2                                              𝑝 = 2
                                                                                            (2)

 7.2           5−𝑥
            𝑦=
               𝑥−2
               −(𝑥 − 2) + 3                                         5−𝑥
                                                             𝑦 = 𝑥−2
            𝑦=
                 (𝑥 − 2)
                3                                                   −(𝑥−2)+3
            𝑦=      −1                                       𝑦 =
               𝑥−2                                                    (𝑥−2)
                                                                                            (2)

 7.3        𝐴(5; 0)
            𝑦 =𝑥−3
            𝑥 =𝑦+3                                           𝑥 = 3
            𝐴′ (0 + 3; 5 − 3)                                𝑦 = 2
            𝐴′ (3; 2)                                                                       (2)

                                                                                             [6]

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10                                MATHEMATICS P1/WISKUNDE V1                              (EC/SEPTEMBER 2017)

QUESTION 8/VRAAG 8

 8.1        𝑓(𝑥) = −2𝑥 2 + 𝑝

                              𝑓(𝑥 + ℎ) − 𝑓(𝑥)
            𝑓 ′ (𝑥) = lim                                               formula/formule
                          ℎ→0        ℎ

                         −2(𝑥 + ℎ)2 + 𝑝 − (−2𝑥 2 + 𝑝)                   substitution of/substitusie van
               = lim                                                                (𝑥 + ℎ)
                     ℎ→0              ℎ

                             −2(𝑥 2 + 2𝑥ℎ + ℎ2 ) + 𝑝 + 2𝑥 2 − 𝑝)
                     = lim
                         ℎ→0                 ℎ

                      −2𝑥 2 − 4𝑥ℎ − 2ℎ2 + 𝑝 + 2𝑥 2 − 𝑝                 simplification to/
               = lim
                  ℎ→0                ℎ                                  vereenvoudiging na
                                                                         (−4𝑥ℎ − 2ℎ2 )
                     −4𝑥ℎ − 2ℎ2
              = lim
                 ℎ→0     ℎ

                     ℎ(−4𝑥 − 2ℎ)                                        common factor/gemene
              = lim
                 ℎ→0     ℎ                                              faktor

              = lim (−4𝑥 − 2ℎ)
                 ℎ→0
                                             Answer ONLY: 0 marks/
              = −4𝑥                          SLEGS antwoord: 0 punte    answer/antwoord

             Penalise 1 mark for incorrect use of
             formula. Must show 𝑓 ′ (𝑥).
             Penaliseer 1 punt vir verkeerde gebruik van
             formule. Moet 𝑓′(𝑥) toon.

                                                                                                         (5)

 8.2                 3   1
            𝐷𝑥 [4 √𝑥 +      + 2]
                        3𝑥
                   1                                                         1
                       1                                                          1
            𝐷𝑥 [4𝑥 3 + 3 𝑥 −1 + 2]            Penalise 1 mark for       4𝑥 3  3 𝑥 −1
                                              incorrect notation. /
              4 2 1
            = 𝑥 −3 − 𝑥 −2                     Penaliseer 1 punt vir
                                                                         4   2
                                                                                      1
              3        3                      verkeerde notasie.       3 𝑥 −3  − 3 𝑥 −2
                                                                                                         (4)

                                                                                                         [9]

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(EC/SEPTEMBER 2017)           MATHEMATICS P1/WISKUNDE V1                                      11

QUESTION 9/VRAAG 9

            𝑓(𝑥) = (𝑥 − 1)2 (𝑥 + 3)
 9.1        𝑓(𝑥) = 𝑥 3 + 𝑥 2 − 5𝑥 + 3                       𝑓(𝑥) = 𝑥 3 + 𝑥 2 − 5𝑥 + 3

            𝑓 ′ (𝑥) = 3𝑥 2 + 2𝑥 − 5                         𝑓 ′ (𝑥) = 0
            3𝑥 2 + 2𝑥 − 5 = 0                               factors/faktore
            (3𝑥 + 5)(𝑥 − 1) = 0
                     5
            𝑥 = − 3 or / of 𝑥 = 1                           𝑥-values/waardes
            𝑓(1) = 0                                        𝑦-values/waardes
                   5    256
            𝑓 (− ) =
                   3     27                                                                   (5)

 9.2
                                        256                shape / vorm
                                        27                 𝑥 − intercepts/𝑥 − 𝑎𝑓𝑠𝑛𝑖𝑡𝑡𝑒

                      −3                                   𝑦 − intercept/𝑦 − 𝑎𝑓𝑠𝑛𝑖𝑡
                               5              1
                             −
                               3                            stationary points/draaipunte

                                                                                              (4)
 9.3        𝑓 ′′ (𝑥) = 6𝑥 + 2                               𝑓 ′′ (𝑥) = 6𝑥 + 2
            6𝑥 + 2 = 0
                     1                                      𝑥 = −3
                                                                      1
            𝑥=−
                     3                                            128                20
                   128            20                        𝑦 = 27 / 4,74 / 4 27
            𝑦=         / 4,74 / 4
                   27             27                                                          (3)

 9.4                   256                                  answer
            0<𝑘<
                       27                                                                     (2)

 9.5        𝑓 ′ (𝑥) = 3𝑥 2 + 2𝑥 − 5
            3𝑥 2 + 2𝑥 − 5 = −5                             𝑓 ′ (𝑥) = −5
            3𝑥 2 + 2𝑥 = 0
            𝑥(3𝑥 + 2) = 0                                   factors/ faktore
                                 2
            𝑥 = 0 or/of 𝑥 = − 3                                       2
                   2    175                                𝑥 = − 3
            𝑓 (− ) =
                   3     27
                                                                  2       175
            𝑦 = −5𝑥 + 𝑐                                    𝑓 (− 3) = 27
            175             2
                  = −5 (− ) + 𝑐
             27             3                               substitution/vervanging
                  85
            𝑐=
                  27                                        answer/antwoord
                         85
            𝑦 = −5𝑥 +
                         27                                                                  (6)
                                                                                            [20]

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12                           MATHEMATICS P1/WISKUNDE V1                 (EC/SEPTEMBER 2017)

QUESTION 10/VRAAG 10

 10.1       243 = 2(𝑥 × 2𝑥) + 2(2𝑥 × ℎ) + 2(𝑥 × ℎ)
            243 = 4𝑥 2 + 4𝑥ℎ + 2𝑥ℎ                        TSA equation and sub/ TOA
            243 = 4𝑥 2 + 6𝑥ℎ                              vergelyking met vervanging
                                                          simplification/
               243 − 4𝑥 2                                 vereenvoudiging
            ℎ=                                                                       (2)
                  6𝑥
                 81 2𝑥
            ℎ=      −
                 2𝑥   3

 10.2                     81 2𝑥
            𝑉 = 2𝑥 × 𝑥 × ( − )                             sub into volume formula/
                          2𝑥  3
                      4 3                                 vervanging in volume formule
            𝑉 = 81𝑥 − 𝑥
                      3                                                               (1)

 10.3       𝑑𝑉
               = 81 − 4𝑥 2
            𝑑𝑥                                            81 − 4𝑥 2
            81 − 4𝑥 2 = 0                                 81 − 4𝑥 2 = 0
                 81
            𝑥2 =                                                 81
                  4                                       𝑥 2 = 4
                9
            𝑥 = = 4.5
                2                                         answer/antwoord              (4)
                                                                                         [7]

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(EC/SEPTEMBER 2017)           MATHEMATICS P1/WISKUNDE V1                                 13

QUESTION 11/VRAAG 11

  11.1                                                     9 × 9 × 9
            9 × 9 × 9 × 5 × 4 = 14580                      5 × 4
                                                            14580
                                                                                        (3)

  11.2.1     12!                                            12!
                   = 119750400                             2!.2!
            2! .2!
                                                            119750400
                                                                                        (3)

  11.2.2          10!                                       10!
                        1                                  
                 2!                                          2!
                      =   = 0,015                           119750400
             119750400 66
                                                            answer/antwoord
                                                                                       (3)
                                                                                       [9]

  11.3.1                           1
                              𝐻=
                                   2
                      1
               𝑀=                1
                      3
                              𝑇=
                                 2                          first branch with values/
                                 1                         eerste tak met waardes
                              𝑇=
                      2          2                          top part of second branch
                𝐹=
                      3                                    with values / boonste gedeelte
                                   1
                              𝐻=                           van tweede tak met waardes
                                   2
                                                            bottom part of second branch
                                                           with values / onderste gedeelte
                                                           van tweede tak met waardes
                                                                                         (3)

  11.3.2                  2
            𝑃(𝐹) =                                                   2
                          3                                𝑃(𝐹) = 3
                                                                                         (1)

  11.3.3             1 1
            𝑃(𝑀/𝐻) =   ×
                     3 2
                     1                                     𝑃(𝑀/𝐻) = 6
                                                                           1
            𝑃(𝑀/𝐻) =
                     6                                                                   (2)

                                                                                       [15]

                                                                  TOTAL/TOTAAL: 150

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