2001
Mathematics
JAMB
If the gradient of the curve y = 2kx2 + x + 1 at x = 1 is 9, find k.
A.
4
B.
3
C.
2
D.
1
Correct Answer: 2
Explanation
y = 2kx2 + x + 1 Gradient function dy/dx = 4kx + 1 at dy/dx = 9, => 9 = 4kx + 1 => 8 = 4kx, and k = 8/4x. At x = 1, k = 8/4 = 2
y = 2kx2 + x + 1 Gradient function dy/dx = 4kx + 1 at dy/dx = 9, => 9 = 4kx + 1 => 8 = 4kx, and k = 8/4x. At x = 1, k = 8/4 = 2THIS WEEK's
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