How do I find the derivative of a function at a given point?

1 Answer
AJ Speller
Oct 1, 2014

First you have to calculate the derivative of the function.

f(x)=x^3f(x)=x3

f'(x)=3x^2

Then if we want to find the derivative of f(x) when x=4 then we substitute that value into f'(x).

f'(4)=3(4)^2=3*16=48

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