If a u2 – 3v2 and b = 2uv + v2 evaluate (2a – b)(a – b2), when u = 1 and v = -1
-
9
- 15
- 27
- 33
The correct answer is: A
Explanation
a = u2 - 3y2 = (1)2 - 3(-1) = -2b = 2uu + v2 + v2
= 2(1)(-1) + (-1)2 = -1
∴ 2(2a - b)(a - b∴) = [2(-2) - 1](-2 - (-1)2)
= -3 - 3
= 9