Cambridge International AS and A Level Mathematics Pure Mathematics 1

Answers

Answers

280

P1^

280

Answers

Chapter  1

●?^ (Page^ 1)

Like terms have the same variable;

unlike terms do not.

Note that the power of the variable

must also be the same, for example

4 x and 5x^2 are unlike terms and

cannot be collected.

Exercise 1A (Page 4)

  1 (i) 9 x

(ii) p − 13

(iii) k − 4 m + 4 n

(iv) 0

(v) r + 2 s − 15 t

  2 (i) 4(x + 2 y)

(ii) 3(4a + 5 b − 6 c)

(iii) 12(6f − 3 g − 4 h)

(iv) p(p − q + r)

(v) 12 k(k + 12 m − 6 n)

  3 (i) 28(x + y)

(ii) 7 b + 13 c

(iii) −p + 24 q + 33 r

(iv) 2(5l + 3 w − h)

(v) 2(w + 2 v)

  4 (i) 2 ab

(ii) n(k − m)

(iii) q(2p − s)

(iv) 4(x + 2)

(v) − 2

  5 (i) 6 x^3 y^2

(ii) 30 a^3 b^3 c^4

(iii) k^2 m^2 n^2

(iv) 162 p^4 q^4 r^4

(v) 24 r^2 s^2 t^2 u^2

  6 (i) bc

(ii) 2 ef

(iii) x 5

(iv) 2 a

(v) (^) pr^2
  7 (i) 1
(ii) 5
(iii) pq
(iv) ghf
23
32
(v) m
n
3
2
  8 (i)  56 x
(ii)  4960 x
(iii) z 3
(iv) 512 x
(v) 2740 y
  9 (i) (^) x^8
(ii) yxxy+
(iii)  4
yx^2
xy

• (iv) pqpq
  (^22) +
  (v) bc–abacc+ab
  10 (i)  31 x 4 –
  (ii) 73 x 15 +
  (iii) 11 x 12 –^29
  (iv) 7610 –^23 x
  (v) 26 x 24 –^3
  11 (i) 12
  (ii) (^) () 21 x^2 + 3
  (iii) (–y 4 x^3 )
  3
  (iv) 6
  (v) xx
  (^332)
  12
  ()+
  ●?^ (Page^ 6)
  A variable is a quantity which can
  change its value. A constant always
  has the same value.
  ●?^ (Page^ 6)
  Starting from one vertex, the
  polygon can be divided into n − 2
  triangles, each with angle sum 180°.
  The angles of the triangles form the
  angles of the polygon.
  ●?^ (Page^ 7)
  You get 0 = 0.
  Exercise 1B (Page 9)
   1  (i) a = 20
  (ii) b = 8
  (iii) c = 0
  (iv) d = 2
  (v) e = − 5
  (vi) f = 1.5
  (vii) g = 14
  (viii) h = 0
  (ix) k = 48
  (x) l = 9
  (xi) m = 1
  (xii) n = 0
  Neither University of Cambridge International Examinations nor OCR bear any responsibility for the example
  answers to questions taken from their past question papers which are contained in this publication.