If 3x + 2y = 12, xy = 6 then the value of 9x2 + 4y2
- 72
72
- 74
- 76
(a + b)2 - (a - b)2 =
2 (a2 - b2)
a (a2 + b2)
4ab
- 4ab
(a + b)2 + (a - b)2 =
2 (a2 + b2)
2 (2ab)
2 (- 2ab)
If a + b = 8 and ab = 12 then a2 + b2 is
42
44
40
48
If x2 + y2 = 29, xy = 2 then the value of x4 + y4 =
831
833
834
835
If a - b = 10, ab = 21 then a2 + b2 =
144
146
142
140
3 3/4
4 3/4
3 1/4
3 1/2
The value of expression 49x2 - 84 xy + 36 y2, when x = 2 and y = 3 is
1600
160
16
1.6
6.3
6
3.2
4.6
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
