# Mathematics Grade 12 KZN March 2019 Memo

> Grade 12 Mathematics memorandum from the KZN March 2019, 21 pages. Read online or get the free PDF download, question paper linked when available.

- Page: https://www.hlayiso.com/library/maths-march-qp-memo-2019-gr12/7deffe34-7655-4b4c-acdb-cb00b283f65a
- Updated: 2026-09-27
- Subject: Mathematics
- Grade: Grade 12
- Document type: Memorandum
- Year: 2019
- Exam period: KZN March
- Curriculum: CAPS
- Pages: 21

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## About this document

Mathematics · Grade 12 · KZN March · 2019. Memorandum, 21 pages. Read online or download the PDF.

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                                     NATIONAL
                                SENIOR CERTIFICATE

                                        GRADE 12

                                     MATHEMATICS

                                    COMMON TEST

                                      MARCH 2019

MARKS: 100

TIME:       2 hours

               This question paper consists of 9 pages and 1 information sheet.

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Mathematics                                      2                          March 2019 Common Test
                                                NSC

INSTRUCTIONS AND INFORMATION

Read the following instructions carefully before answering the questions.

1.      This question paper consists of 9 questions.

2.      Answers ALL questions.

3.      Clearly show ALL calculations, diagrams, graphs, etc cetera that you have used
        in determining yours answers.

4.      Answers only will not necessarily be awarded full marks.

5.      An approved scientific calculator (non-programmable and non-graphical) may
        be used, unless stated otherwise.

6.      If necessary, answers should be rounded off to TWO decimal places, unless stated
        otherwise.

7.      Diagrams are NOT necessarily drawn to scale.

8.      Number the answers correctly according to the numbering system used in this
        question paper. Write neatly and legibly.

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Mathematics                                            3                               March 2019 Common Test
                                                      NSC

QUESTION 1

Given the quadratic sequence: 2 ; 5 ; 10 ; 17 ; . . .

1.1     Write down the next two terms of the quadratic sequence.                                        (2)

1.2     Calculate the nth term of the quadratic sequence.                                               (4)

                                                                                                        [6]

QUESTION 2

2.1     Given the combined constant and arithmetic sequences:

        5 ; 4 ; 5 ; 7 ; 5 ; 10 ; ...

        Determine the position of the term 1051 in the combined sequence.                              (3)

2.2     The series 3 + 8 + 13 + … consists of n terms. The sum of the last three terms is 699.

        2.2.1 Determine the sum to n terms in terms of n.                                              (2)

        2.2.2 If the last three terms are excluded from the series, then determine in terms of
              n the sum of the remaining terms.                                                        (2)

        2.2.3 Hence, or otherwise, determine the value of n.                                           (3)

                                                                                                       [10]

QUESTION 3

3.1     The sixth term of a geometric sequence is 80 more than the fifth term.

                                  80
        3.1.1   Show that a =          .                                                               (2)
                                r − r4
                                 5

        3.1.2   If it is further given that sum of the fifth and sixth terms is 240, determine the
                value of the common ratio.                                                             (5)

3.2     Write the geometric series 9 + 3 + 1 ; … to 130 terms in sigma notation.                       (2)

                                                                                                       [9]

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Mathematics                                           4                       March 2019 Common Test
                                                     NSC

QUESTION 4

                                             
In the diagram below, BC = CE; E1 = x and D1 = D2 .

                                                                                  B
                                                                                  B

4.1     Name, with reasons, TWO other angles each equal to x and show that FD = FE.           (4)

4.2     Prove that BF bisects CBˆ A .                                                         (4)

4.3     Hence, or otherwise, prove that Â1 = CBˆ A .                                         (4)

                                                                                              [12]

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                                                     5                          March 2019 Common Test
                                                    NSC

QUESTION 5

5.1     The angle at the point of contact between a tangent to a circle and a
        chord is --------------- .                                                             (1)

5.2     In the sketch below, circle centre O has a tangent KLM.
        Diameter NQ produced meet the tangent in K.
        Nˆ 1 = 32 º and Nˆ 2 = 230 .

        Calculate, with reasons, the size of:

        5.2.1   P̂2                                                                            (1)

        5.2.2   POˆ Q                                                                          (2)

        5.2.3   L̂2                                                                            (2)

        5.2.4   NL̂Q                                                                           (1)

        5.2.5   L̂3                                                                            (2)

        5.2.6   PLˆ K                                                                          (2)

                                                                                               [11]

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Mathematics                             6                            March 2019 Common Test
                                       NSC

QUESTION 6

                                                                 AD AE
In the diagram below,      has   Prove the theorem that states     =   .
                                                                 DB EC

                                                                                    [7]

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Mathematics                                     7                            March 2019 Common Test
                                               NSC

QUESTION 7

In the diagram below, EFGK is a cyclic quadrilateral with Fˆ = 900 .
EK and FG are produced to meet at H. HJ is drawn parallel to FE. GK produced meets HJ at J.

7.1     Prove that:

        7.1.1   JHˆ F = 900                                                                   (2)

        7.1.2   Kˆ 2 = 900                                                                    (2)

        7.1.3  HKG ⫼  JHG                                                                   (3)

7.2     Calculate JG and KG if HG = 5cm and JH = 10cm.                                        (4)

                                                                                              [11]

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Mathematics                                        8                             March 2019 Common Test
                                                  NSC

QUESTION 8 (ANSWER THIS QUESTION WITHOUT THE USE OF CALCULATOR)

8.1     Show

                                                                                               (4)

8.2     If sin 360 = m , and cos 240 = n, determine the following in terms of m and /or n:

        8.2.1 cos 360                                                                           (3)

        8.2.2 sin 12 0                                                                          (4)

8.3     Simplify:

                                                                                               (5)

8.4     Calculate the value of

                                                        if

                                                                                                (4)

                                                                                                [20]

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Mathematics                                           9                            March 2019 Common Test
                                                     NSC

QUESTION 9

Given f(x) = sin x + 1 and g(x) = cos 2x

9.1     Show that f(x) = g(x) can be written as (2 sin x + 1) sin x = 0.                              (2)

9.2     Hence or otherwise determine the general solution of sin x + 1 = cos 2x.                      (6)

9.3     Write down the range of g(x) – 1.                                                             (1)

9.4     Consider the following geometric series

        Determine the values of x for the interval                for which the series will
        converge.                                                                                     (5)

                                                                                                      [14]

                                                                    TOTAL MARKS:                      [100]

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Mathematics                                                             10                                        March 2019 Common Test
                                                                       NSC

                                        INFORMATION SHEET: MATHEMATICS

                                               INLIGTINGSBLAD: WISKUNDE

       − b  b 2 − 4ac
    x=
             2a
    A = P(1 + ni)               A = P(1 − ni)                  A = P(1 − i) n                              A = P(1 + i) n

    Tn = a + (n − 1)d                    Sn =
                                                n
                                                  (2a + (n − 1)d )
                                                2

    Tn = ar n −1                         Sn =
                                                 (
                                                a r n −1   ) ;           r 1                   S =
                                                                                                          a
                                                                                                              ; −1  r  1
                                                  r −1                                                   1− r

    F=
           
         x (1 + i ) − 1
                       n
                                                    P=
                                                          x[1 − (1 + i)−n ]
                i                                                 i
                        f ( x + h) − f ( x )
    f ' ( x) = lim
                   h→ 0          h
                                                                  x + x2 y1 + y 2 
     d = ( x 2 − x1 ) 2 + ( y 2 − y1 ) 2                      M  1     ;         
                                                                  2         2 

                                                                                             y 2 − y1
     y = mx + c                          y − y1 = m( x − x1 )                           m=                         m = tan 
                                                                                             x 2 − x1

     (x − a )2 + ( y − b)2 = r 2
                          a     b     c                                                                                     1
     In ABC:                =     =                          a 2 = b 2 + c 2 − 2bc. cos A                area ABC =         ab. sin C
                        sin A sin B sin C                                                                                   2
    sin( +  ) = sin  . cos  + cos . sin                          sin( −  ) = sin  . cos  − cos . sin 
    cos( +  ) = cos . cos  − sin  . sin                            cos( −  ) = cos . cos  + sin  . sin 

             cos2  − sin 2 
             
    cos 2 = 1 − 2 sin 2                                               sin 2 = 2 sin  . cos
             2 cos2  − 1
             
                                                                                    n            2

         fx                                                                        (x − x )
                                                                                         i
     x=                                                                   = i =1
                                                                              2

               n                                                                         n
                   n( A )
    P( A) =                                                              P(A or B) = P(A) + P(B) - P(A and B)
                   n(S)

     yˆ = a + bx                                                         b=
                                                                                   (x − x )( y − y )
                                                                                    (x − x)         2

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Mathematics                       11           March 2019 Common Test
                                 NSC

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                                 MATHEMATICS

                           MARKING GUIDELINE

                                 COMMON TEST

                                    MARCH 2019

                                  NATIONAL
                             SENIOR CERTIFICATE

                                     GRADE 12

 MARKS: 100

                       This marking guideline consists of 10 pages.

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Mathematics P2                                             2                        March 2019 Common Test
                                                          NSC

QUESTION 1

 1.1      26 ; 37                                               AA correct values                   2
 1.2       2               5                10           17

                      3                5             7

                          2                 2

                                   𝟐𝒂 = 𝟐                       A a value
                                   𝒂=𝟏
                                                                CAb value
                                   𝟑𝒂 + 𝒃 = 𝟑
                                   𝒃=𝟎                          CAc value
                                   𝒂+𝒃+𝒄=𝟐
                                   𝒄=𝟏                          CAgeneral term
                                   𝑻𝒏 = 𝒏𝟐 + 𝟏
                                                                OR
          OR                                                                                          4
                                       2𝑎 = 2
                                                                A a value
                                       𝑎=1
                                       3𝑎 + 𝑏 = 3               CAb value
                                       𝑏=0
                                                                Ac value
                                       𝑇0 = 𝑐 = 1
                                       𝑇𝑛 = 𝑛2 + 1              CAgeneral term
          OR

          T  T  n  1d 
                             n  1n  2 d                   OR
                                                                                                      4
           n      1            1                     2
                                        2                       Aformula

                2  n  13 
                                  n  1n  2 2            Asubstituting first and second
                                         2                      difference values
                2  3n  3  n  3n  2
                                2
                                                                CAsimplifying
                n2  1
                                                                CAgeneral term

          OR                                                    OR
               n 1
          Tn        2a  n  2d   T1                      Aformula                             4
                 2
                                                                Acorrect substitution into formula
               n 1
                    2(3)  (n  2)(2)  2                    CAsimplifying
                 2
              (n  1)3  n  2  2
              (n  1)( n  1)  2                              CAgeneral term
                n 1 2  n 1
                  2                2

                                                                                                      4
                                                                                                      [6]
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Mathematics P2                                 3                           March 2019 Common Test
                                              NSC
QUESTION 2

 2.1                       3𝑛 + 1 = 1051            Aequating nth term to 1051
                           3𝑛 = 1050
                           𝑛 = 350
                                                    CAvalue of n
                              th
          1051 is in the 700 position               CAconclusion                         3
 2.2.1     a  3, d  5                             A d = 5

          Sn  2a  (n  1)d 
               n
               2
              2(3)  (n  1)(5)
               n                                    CAsubstitution of a & d into sum
               2                                    formula
              5n  1
               n
               2                                                                          2

                   n3                              A n – 3
 2.2.2
          S n3       5(n  3)  1
                    2                               CAsubstituting into sum formula
                   n3
                      5n  14                                                          2
                    2
 2.2.3       𝑆𝑛 − 𝑆𝑛−3 = 699
             𝑛            𝑛−3
               [5𝑛 + 1] −      [5𝑛 − 14] = 699      CAforming equation
             2             2
             𝑛(5𝑛 + 1) − (𝑛 − 3)(5𝑛 − 14) = 1398
             5𝑛2 + 𝑛 − 5𝑛2 + 29𝑛 − 42 = 1398
             30𝑛 = 1440                             CAsimplification
             𝑛 = 48
                                                    CAanswer (n must be a natural
                                                    number)                               3
          OR                                        OR
          Tn = 5n – 2
          Tn-1 = 5(n-1) – 2
          Tn-2 = 5(n-2) – 2                         CAforming equations
          15n – 21 = 699
                                                    CAsimplification
          n = 45                                                                          3
                                                    CAanswer (n must be a natural
                                                    number)

                                                                                          [10]

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Mathematics P2                                        4                          March 2019 Common Test
                                                     NSC
QUESTION 3

 3.1.1                   𝑇6 = 80 + 𝑇5
                         𝑎𝑟 5 = 80 + 𝑎𝑟 4
                                                           Aforming equation
                         𝑎𝑟 5 − 𝑎𝑟 4 = 80
                         𝑎(𝑟 5 − 𝑟 4 ) = 80                Afactorizing
                                80
                         𝑎= 5
                              𝑟 − 𝑟4
                                                                                                2
 3.1.2           𝑇5 + 𝑇6 = 240
                 𝑎𝑟 4 + 𝑎𝑟 5 = 240
                                                           Aforming equation
                 𝑎(𝑟 4 + 𝑟 5 ) = 240
                        240                                CAfactorizing
                 𝑎= 4
                      𝑟 + 𝑟5
                    80         240                         CAequating
                  5     4
                          = 5
                 𝑟 −𝑟         𝑟 + 𝑟4                       [

                 80𝑟 + 80𝑟 4 = 240𝑟 5 − 240𝑟 4
                     5
                                                           CAsimplifying
                 320𝑟 4 = 160𝑟 5
                 𝑟=2                                       CAr – value

          OR                                               OR
                                                                                                5
          Let the fifth term be = x and sixth term = y,
          then
                       𝑥 + 𝑦 = 240 → (1)
                                                           Aforming equation (1)
                       −𝑥 + 𝑦 = 80 → (2)
                       (1) + (2)                           Aforming equation (2)
                       2𝑦 = 320
                                                           CA y – value
                       𝑦 = 160; 𝑥 = 80
                           160                             CAx – value
                       𝑟=      =2
                            80                                                                  5
                                                           CA r – value
 3.2                       130                             Aupper and lower limit values
                              1 𝑘−1
                           ∑9( )
                              3                            A kth term                          2
                           𝑘=1

                                                                                                [9]

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Mathematics P2                                      5                     March 2019 Common Test
                                                   NSC

QUESTION 4

 4.1      𝐵̂2 = 𝐸̂1 = x …….. (BC = CE)                        A S/R
          𝐷̂1 = 𝐵̂2 = x … (Ext. ∠ of cyclic quad = interior
                                                              A S AR
                        opposite angles)
                               ̂1 = 𝐸̂1
                              ∴𝐷                              A S
          ∴FD = FE                                                                       (4)
 4.2      ̂2 = 𝐷
          𝐷    ̂1 = x …… given                                A S
          ̂2 = 𝐵̂1 = 𝑥 … subtended by arc AF
          𝐷                                                   A S A R
           𝐵̂1 = 𝐵̂2                                         A S
          ∴EB bisects 𝐶𝐵̂ 𝐴
                                                                                         (4)
 4.3      𝐴̂1 = 𝐹̂2 …… subtended by arc                       A S AR
          𝐹̂2 = 2𝑥 ….. ext. ∠ of ΔDFE                         A S AR
           𝐴̂1 = 2𝑥 = 𝐶𝐵̂ 𝐴
                                                                                         (4)

                                                                                         [12]

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Mathematics P2                                         6                 March 2019 Common Test
                                                      NSC

QUESTION 5

 5.1      …….. equal to the angle subtended by the          AS                          (1)
          chord in the opposite circle segment.

 5.2.1    𝑃̂2 = 23° …… (ON = OP; radii)                     A S/R                       (1)

 5.2.2    𝑃𝑂̂ 𝑄 = 2𝑁
                   ̂2 = 46° …… (∠at centre) /               A S AR                     (2)
                                (Ext ∠of𝛥)
 5.2.3    𝐿̂2 = 𝑁
                ̂2 = 23°…… (subt. by arc PQ)                A S AR                     (2)

 5.2.4    𝑁𝐿̂𝑄 = 90° …… (subt. by diameter NQ)              AS/R                        (1)

 5.2.5    𝐿̂3 = 90° − 23°                                   CA S
                 = 67o                                      CA answer                   (2)
          OR
                                                            OR
          𝑃𝑂̂ 𝑁 = 134°      …..(angles of triangle)
          𝑃𝑂̂ 𝑁 = 2𝐿̂       …..(angle at centre theorem)    CA S

                  = 67°                                     CA answer                   (2)

 5.2.6    𝑃𝐿̂𝐾 = 𝐿𝑁
                  ̂ 𝑃 …… (tan-chord theorem)                A S/R
                  = 32o + 23o
                  = 55o                                     A answer                    (2)
                                                                                         [11]

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Mathematics P2                                      7               March 2019 Common Test
                                                   NSC

QUESTION 6

 Construction: Draw line h1⊥AC and h2 ⊥AB                       A construction

 Proof:
                                  1
           𝐴𝑟𝑒𝑎 𝑜𝑓 ∆𝐴𝐷𝐸           2
                                    . 𝐴𝐷. ℎ2                    A S
           𝐴𝑟𝑒𝑎 𝑜𝑓 ∆𝐵𝐷𝐸
                          =       1            𝑠𝑎𝑚𝑒 ℎ𝑒𝑖𝑔ℎ𝑡 ℎ2   A R
                                    . 𝐷𝐵.ℎ2
                                  2

                              1
          𝐴𝑟𝑒𝑎 𝑜𝑓 ∆𝐴𝐷𝐸            . 𝐴𝐸. ℎ1                      A S/R
 and      𝐴𝑟𝑒𝑎 𝑜𝑓 ∆𝐶𝐸𝐷
                       = 21                    𝑠𝑎𝑚𝑒 ℎ𝑒𝑖𝑔ℎ𝑡 ℎ1
                                  . 𝐸𝐶. ℎ1
                              2

 but   𝑎𝑟𝑒𝑎 𝑜𝑓 ∆𝐵𝐷𝐸 = 𝑎𝑟𝑒𝑎 𝑜𝑓 ∆𝐶𝐸𝐷
       ∵ (𝑠𝑎𝑚𝑒 𝑏𝑎𝑠𝑒 𝐷𝐸; 𝑡ℎ𝑒 𝑠𝑎𝑚𝑒 ℎ𝑒𝑖𝑔ℎ𝑡; 𝐷𝐸 ∥ 𝐵𝐶)               AA S/ R

           𝐴𝑟𝑒𝑎 𝑜𝑓 ∆𝐴𝐷𝐸       𝐴𝑟𝑒𝑎 𝑜𝑓 ∆𝐴𝐷𝐸                      A S
       ∴                  =
           𝐴𝑟𝑒𝑎 𝑜𝑓 ∆𝐵𝐷𝐸       𝐴𝑟𝑒𝑎 𝑜𝑓 ∆𝐶𝐸𝐷

           𝐴𝐷 𝐴𝐸
       ∴     =
           𝐷𝐵 𝐸𝐶

                                                                                     [7]

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Mathematics P2                                     8                       March 2019 Common Test
                                                  NSC

QUESTION 7

 7.1
 7.1.1     ̂ 𝐹 + 𝐹̂ = 180 ° …. Co-interior angles; JH // EF
          𝐽𝐻                                                  A S/R
             ̂ F = 90o …… 𝐹̂ = 90 ° (given)
          ∴ J𝐻                                                A S                        (2)

 7.1.2    ̂2 = 𝐹̂ = 90° …… ext. ∠ of cyclic quad
          𝐾                                                   AA S/R                    (2)

 7.1.3    In ΔHKG and ΔJHG
          ̂1 = 𝐺
          𝐺    ̂1 …… common                                   A S/R
          ̂2 = 𝐽𝐻
          𝐾     ̂ 𝐺 = 90 ° …… proved                          A S/R
             ̂ 𝐺 = 𝐻𝐽̂𝐺 …… remaining ∠
          ∴ 𝐾𝐻
          ∴ ∆𝐻𝐾𝐺///∆𝐽𝐻𝐺 …… (∠∠∠)                              A R                        (3)

 7.2      JG2 = HJ2 + HG2 …… Pythagoras
                 = 102 + 52
                 = 125cm2
          JG= √125𝑐𝑚2
                     = 5√5cm                                  A 5√5

          𝐾𝐺 𝐻𝐺
             =
          𝐻𝐺   𝐽𝐺                                             A ∆𝐻𝐾𝐺///∆𝐽𝐻𝐺

                     𝐻𝐺 2
          𝐾𝐺 =
                      𝐽𝐺
              52
          =
              5√5                                             CA substitution
               5
          =
              √5
               5√5
          =
                 5
          = √5 cm                                             CA answer in any form
          = 2,24 cm                                                                       (4)
                                                                                          [11]

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QUESTION 8

 8.1      (cos 𝑥)(cos 𝑥)(− tan 𝑥)                                  A− tan 𝑥
                  − cos 𝑥                                          Acos 𝑥
                             sin 𝑥                                   sin 𝑥
                                                                   Acos 𝑥
            (cos 𝑥)(cos 𝑥) (
          =                  cos 𝑥)
                     cos 𝑥                                         Acos 𝑥
          = sin 𝑥                                                                                  (4)
 8.2
 8.2.1

                           1
                                                         1
                                            1  n2
         m

                                      36o                    24o

                 1  m2                              𝑛             A A diagrams
                     (A)                             (B)

          cos 36o = √1 − 𝑚2                                        CA √1 − 𝑚2 answer

                                                                                                   (3)
 8.2.2    sin 12 = sin (36 – 24 )
                o                     o       o
                                                                   A compound angle
                 = sin 36o cos 24o – cos 36o sin 24o               A expansion
                 = m n – (√1 − 𝑚2 )(√1 − 𝑛2 )                      CACA answer                   (4)
          OR                                                       OR
                               1−𝑐𝑜𝑠24°
          sin 12o = √             2
                                                                   A A
                                                                   CACA answer                   (4)
                               1−𝑛
                     =√ 2
 8.3      2 cos 75° cos 15°                                        Acos 75°
          cos[45° − 𝑥 + 𝑥]
             2 sin 15° cos 15°                                     Acos[45°]
          =                                                        Asin 15°
                  cos 45°
             sin 30°
          =                                                             sin 30°
             cos 45°                                               A
             1     1                                                    cos 45°
          = ÷
             2 √2
             √2                                                    CAanswer in any form
          =                                                                                        (5)
              2
 8.4      𝑠𝑖𝑛2 3𝑥 − 2 sin 3𝑥 cos 3𝑥 + 𝑐𝑜𝑠 2 3𝑥                     Aexpansion
          = 1 − sin 2(3𝑥)                                          A1 − sin 2(3𝑥)
          = 1 − sin 6𝑥                                                    −2
                                                                   A1 − ( )
                   −2                                                             5
          =1−( )
                    5
               2
          =1                                                       Aanswer in any form            (4)
               5
                                                                                                   [20]

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Mathematics P2                            10                          March 2019 Common Test
                                         NSC
QUESTION 9

 9.1     sin 𝑥 + 1 = 1 − 2𝑠𝑖𝑛2 𝑥                                        Aequating
         2𝑠𝑖𝑛2 𝑥 + sin 𝑥 = 0                                            Astandard form
         sin 𝑥 (2 sin 𝑥 + 1) = 0                                                                (2)
 9.2     sin 𝑥 (2 sin 𝑥 + 1) = 0                                        Asin 𝑥 = 0
         sin 𝑥 = 0         or             2 sin 𝑥 = −1                              1
                                                                        Asin 𝑥 = − 2
                                                     1
         𝑥 = 0° + 𝑘. 360°; 𝑘 ∈ ℤ          sin 𝑥 = − 2                   A0° + 𝑘. 360°
         𝑥 = 180° + 𝑘. 360°; 𝑘 ∈ ℤ        𝑥 = 210° + 𝑘. 360°; 𝑘 ∈ ℤ     A 𝑘 ∈ ℤ
                                          𝑥 = 330° + 𝑘. 360°; 𝑘 ∈ ℤ     CA210° +
                                                                        𝑘. 360°                 (6)
                                                                        CA330° +
                                                                        𝑘. 360°

 9.3     −2 ≤ 𝑦 ≤ 0                                                     Aanswer                (1)

 9.4     𝑟 = 2 cos 2𝑥                                                   A𝑟 = 2 cos 2𝑥
         −1 < 2 cos 2𝑥 < 1                                              A−1 < 𝑟 < 1
         −1            1             1                                  CA
          2
            < cos 2𝑥 < ; If cos 2x = 2
                       2                                                −1            1
         ∴ 2𝑥 = 60°                                                        < cos 2𝑥 <
         then 𝑥 = 30°                                                    2            2
         ∴ 30° < 𝑥 < 90°
                                                                        CA 𝑥 = 30°
                                                                        CAanswer
                                                                         30° < 𝑥 < 90°          (5)
                                                                                                [14]

                                                               TOTAL MARKS:             [100]

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