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Math Help - How do you find the second derivative?

  1. #1
    Junior Member
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    How do you find the second derivative?

    For example,
    if f(x)=x^9+4x^3+3x, find the second derivative f " (x).

    im so confused...i honestly have no idea
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  2. #2
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    f(x)=x^9+4x^3+3x
    to find the second derivative, you simply take the first derivative, then from that result do the exact same thing to get the second.

    f'(x)= 9x^8 + 12x^2 +3
    f''(x) = 72x^7 + 24x
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  3. #3
    Member Greengoblin's Avatar
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    Remember the derivative of a function f(x) is another function (The 'Gradient function'), denoted f '(x), so all you do is take the derivative of this function to get the 'second derivative,' f''(x)....so it's as easy as that - differentiate twice. Think you can do it now?

    edit: beaten to the mark
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  4. #4
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    yes....thank you both very much
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