1

x = 4 or -10

2
x = 3
3
x = 0 or 8
4
x = 5.37 or x = -0.37 (to 2 d.p.)
5
x = -3 +√ 2 or -3 − √2
6
x = -2
7
x = 25
8
x = 1 + √3 or 1 − √3
9
x = 0.25
10
x = 0.5 +√5/2 or 0.5 − √5/2
11
x = 5 or -5
12
x = 4
13
x = 1
14
x = -0.42 or x = -1.58 (to 2 d.p.)
15
x = 0 or x = 1
16
x = 9
17
y = 1.6
18
x = 2.04 (to 2 d.p.)
19
x = 2.10 (to 2 d.p.)
20
x = 1.01 (to 2 d.p.)