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Thread: ln make me feel stu...

  1. March 1st 2008, 04:37 PM #1
    eniav
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    ln make me feel stu...

    Find the derivative:
    y = 5^(7x)
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  2. March 1st 2008, 04:40 PM #2
    bobak
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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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