Question on: JAMB Mathematics - 2004
Find the derivatives of the function y = 2x2(2x - 1) at the point x = -1
A
18
B
16
C
-4
D
-6
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Correct Option: B
y = 2x2(2x - 1)
y = 4x3 - 2x2
dy/dx = 12x2 - 4x
at x = -1
dy/dx = 12(-1)2 - 4(-1)
= 12 + 4
= 16
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