Find the derivatives of the function y = 2x2(2x - 1)...
Find the derivatives of the function y = 2x2(2x - 1) at the point x = -1?
18
16
-4
-6
Correct answer is B
y = 2x2(2x - 1)
expand the bracket
y = 4x3 - 2x2
dy/dx = 12x2 - 4x
at x = -1
dy/dx = 12(-1)2 - 4(-1)
= 12 + 4
= 16
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