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Math Help - ln make me feel stu...

  1. #1
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    Joined
    Mar 2008
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    5

    ln make me feel stu...

    Find the derivative:
    y = 5^(7x)
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  2. #2
    Super Member
    Joined
    Oct 2007
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    London / Cambridge
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    y = 5^{7x}

    \ln y = 7x \ln 5

    \frac{1}{y} \frac{dy}{dx} = 7 \ln 5

     \frac{dy}{dx} = 7 \ln 5 \  y

     \frac{dy}{dx} = 7 \ln 5 \ 5^{7x}
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