If x2 + 1/x2 = 27, find the value of x - 1/x
5
29
√29
57
If a - b = 10, ab = 21 then a2 + b2 =
144
146
142
140
6.3
6
3.2
4.6
If x = 5/4 then the value of 16x2 + 24x + 9 is
68
64
81
49
If x + y = 9 and xy = 16, find the value of x2 + y2.
113
65
97
If (ax3 + 2)2 = a2x6 + x3 + 4, then a =
1
1/2
4
1/4
If 3x + 2y = 12, xy = 6 then the value of 9x2 + 4y2
- 72
72
- 74
- 76
Find the product (7 p - 8 q) (7 p - 8 q)
49 p2 - 30 pq + 64 q2
49 p2 - 112 pq + 64 q2
49 p2 - 112 pq - 64 q2
49 p2 + 30 pq + 64 q2
(t - 3)2 - (t + 3)2 equals
2 t2 + 18
-12 t
12 t
18
If x2 + y2 = 29, xy = 2 then the value of x4 + y4 =
831
833
834
835
