i have the answer as f''(x)=12x^2 - 24x and i am not sure how/why i have that

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- Mar 25th 2009, 04:50 PMcalcconfusedThe steps to find f''(x)=x^4 - 4x^3
i have the answer as f''(x)=12x^2 - 24x and i am not sure how/why i have that

- Mar 25th 2009, 04:54 PMPinkk
Do you mean $\displaystyle f(x)=x^{4}-4x^{3}$? If so:

$\displaystyle f'(x)=4x^{3}-12x^{2}$

$\displaystyle f''(x)=12x^{2}-24x$ - Mar 25th 2009, 04:59 PMcalcconfused
- Mar 25th 2009, 05:05 PMPinkk
Just take the derivative, then take the derivative of the derivative.