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Math Help - [SOLVED] second derivative

  1. #1
    DBA
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    [SOLVED] second derivative

    I need the second derivative of f(x)= (x+1)/ sqrt[(x^2) +1]

    I got f'(x)= (1-x) / [(x^2) +1]^(3/2)

    Solution for f''(x)=[(2x^2) - 3x -1] / [(x^2) +1]^(5/2)

    I tried the Quotient Rule but I do not get the solution...

    Can someone explain how to get to the solution?
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  2. #2
    DBA
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    Thanks, I was able to figure it out with the product rule...
    I just wrote it in a different way
    f'(x) = (1-x) * [(x^2) +1)]^(-3/2) and used the product rule.
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