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Math Help - The steps to find f''(x)=x^4 - 4x^3

  1. #1
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    The 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
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  2. #2
    Senior Member Pinkk's Avatar
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    Do you mean f(x)=x^{4}-4x^{3}? If so:

    f'(x)=4x^{3}-12x^{2}
    f''(x)=12x^{2}-24x
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  3. #3
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    Quote Originally Posted by Pinkk View Post
    Do you mean f(x)=x^{4}-4x^{3}? If so:

    f'(x)=4x^{3}-12x^{2}
    f''(x)=12x^{2}-24x

    thats what i thought. i think my professor made an error. the original is f(x) = x^4 - 4x^3. he said then that f''(x) = 12x^2 - 24x. that made no sense to me...
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  4. #4
    Senior Member Pinkk's Avatar
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    Just take the derivative, then take the derivative of the derivative.
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