082-Engineering-Mathematics-Anthony-Croft-Robert-Davison-Martin-Hargreaves-James-Flint-Edisi-5-2017

Review exercises 1 53
[ (
(d) 3 z − 3 ) ] 2
− 31 = 0
2 12
[ (
(e) 5 v + 1 ) ] 2
− 121 = 0
10 100
9 x=−4,1,7
Solutionssame asforQuestion 7
10 (a)t 5 (b) −2r2
6
(c) v>−1 (d)x8
(e) x −4orx8
(f) −1<x<3
(g) x<−1orx3
(h) 4− √ 11x4+ √ 11
(i) √ 0<x 6,x − √ 6
(j) x>5or−1<x<3
b 2x
11 (a) (b) (c)
4 y
(d)
x +1
2x−1
(e)
z
xy
3t+2
4 −t
x +5
12 (a)
x +1
3t
(d)
4z
13 (a)
(c)
14 (a)
(b)
(c)
(d)
(e)
x +1
x +2
3(x +1)
2
y −2
(b)
y +7
x −2
(e)
x +1
(b)
3(x +3)
4(x +2)
8x+23
(x +1)(x +6)
3x 2 +7x+4
(2x −1)(x +5)
5x 2 −29x+3
(x −6)(x +3)
x 2 −2x−1
x −3
2x 4 −x 3 −x 2 −2x−2
(x +1)(x 2 +1)
(c)
x +4
x −1
(d) x 3 (e) 1