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Shayna

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Find the value of a so that the function f(x) = xe^(ax) has critical point at x = 9

I found that the derivative is axe^(ax)+e^(ax)

But I am not sure where to go from here?

  • Shayna -

    e^(ax) (ax+1) = 0 for derivative = 0
    so
    a = -1/x
    a = -1/9

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