JAMB - Mathematics (2021 - No. 8)
Find the derivative of the function y = 2x\(^2\)(2x - 1) at the point x = -1?
18
16
-4
-6
Explanation
y = 2x\(^2\)(2x - 1)
y = 4x\(^3\) - 2x\(^2\)
dy/dx = 12x\(^2\) - 4x
at x = -1
dy/dx = 12(-1)\(^2\) - 4(-1)
= 12 + 4
= 16
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