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Differentiate (1 Viewer)

nsbrando

nsbrando

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Jun 19, 2012
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87
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HSC
2013
ok i am struggling on this question,

Q. if y=x^4 - 2x^3 + 5, find dy/dx when x=-2

so far i got to:

f(x) = 4x^3
f(-2) = -32

what do i do next???
 
Thief

Thief

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Dec 18, 2010
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561
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HSC
2013
f '(x) = 4x^3 - 6x^2

f'(-2) = 4(-2)^3 - 6 (-2)^2
= -32 - 24
= -56
 
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