The degree of 5 x7 - 4 x3 + 2 x2 is
12
7
6
None of these
(a + b)2 + (a - b)2 =
2 (a2 - b2)
2 (a2 + b2)
2 (2ab)
2 (- 2ab)
The value of expression 49 x2 - 84 xy + 36 y2, when x = 2 and y = 3 is
1600
160
16
1.6
If a + b = 8 and ab = 12 then a2 + b2 is
42
44
40
48
1022 =
204
10404
10400
102
If x2 + 1/x2 = 27, find the value of x - 1/x
5
29
√29
57
(3 x - y) (9 x2 + 3 xy + y2)=
9 x2 + y2
27 x3 - y3
27 x3 + y3
x2 - y2
If (a x3 + 2)2 = a2x6 + x3 + 4, then a =
1
1/2
4
1/4
If x + y = 9 and xy = 16, find the value of x2 + y2.
113
49
65
97
If x = 1, y = -1 and z = -1 , find the value of x3 + y3 + z3 - 3 xyz.
- 4
2
0