Page 39 - Spotlight A+ Form 4 & 5 Mathematics KSSM

ANSWERS Complete answers

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FORM 4
6. y
Chapter 1 Quadratic Functions and Equations in One y = x + 4
2
Variable 8
6
1.1 4
1 y = x 2
1. 9y + 16, k 2 2
2
5
2. (a) Yes; One variable, c and the highest power of c
is 2. –2 –1 O 1 2 x
(b) No; The power of y is not a whole number. –2
(c) No; Two variables, a and b. y = x – 3
2
(d) Yes; One variable, p and the highest power of p Graph y = x + 4 is the translation of the graph y = x 2
2
is 2. four units upwards, graph y = x – 3 is the translation
2
3. (a) Two values x = –1 and x = 1 are mapped to one of the graph y = x three units downwards.
2
value y = 3. b
2
(b) y 7. The axis of symmetry x = – of the graph y = x + bx
2
4 changes with the value of b.
2
y = –x + 4 8. (a) (x + 12x + 35) cm 2
2
2 (b) x + 12x – 288 = 0
2
x 9. (a) No (b) Yes (c) Yes
–3 –2 –1 O 1 2 3 5
–2 10. (a) x = 4 or x = –1 (b) x = – or x = 2
2
3 8
–4 (c) x = or x = 1 (d) x = or x = –3
4 3 FORM 4 ANSWERS
Maximum point (0, 4), axis of symmetry x = 0 11. (a) y (b) y
y
4. ©PAN ASIA PUBLICATIONS
4 5 4
1
–
y = x 2 O x O x
2 2
x
–3 –2 –1 O 1 2 3 (c) y (d) y
1
–2 y =– x 2
–
2 1 x
–4 O
–3
x
O
1 1
Graphs y = x and y = – x are congruent and
2
2
2 2
reflected on the x-axis.
5. y 12. (a) y (b) y
16
14 x
x –4 O
O 2
12
y = 4x 2
10
8
(c) y (d) y
3
–
6 y = x 2
2
4 x
O 1 x O 2
2
2 y = x –
2
x
–2 –1 O 1 2
increases steeper
451
Answer Spotlight A+ Math F4.indd 451 15/03/2021 2:12 PM