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Math Help - derivatives

  1. #1
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    derivatives

    let f be the function given by f(x)=2e^4x^2. for what value of x is the slope of the line tangent to the graph of f at (x,f(x)) equal to 3?
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  2. #2
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    <br />
\begin{array}{l}<br />
 \frac{{df}}{{dx}} = \frac{d}{{dx}}2e^{4x^2 }  \\ <br />
 u = 4x^2  \\ <br />
 \frac{{df}}{{dx}} = \frac{{df}}{{du}}\frac{{du}}{{dx}} = 2e^u 8x = 16xe^{4x^2 }  \\ <br />
 \end{array}<br />
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  3. #3
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    I understand how to get the derivative but now what?
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