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Math Help - Second Derivative

  1. #1
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    Second Derivative

    I think my answer is wrong for this problem. Iv'e work is several times and come up with this.

    Find f(x)''if f(x)=\sqrt{2x+5}

    My answer is \frac{(2x+5)^{-1/2}}{(2x+5)^{5/2}}
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  2. #2
    Senior Member vincisonfire's Avatar
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    Answer is  -\frac{1}{(2x+5)^{\frac{3}{2}}}
     f'(x) = \frac{1}{(2x+5)^{\frac{1}{2}}}
     f''(x) = -\frac{1}{(2x+5)^{\frac{3}{2}}}
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