Answer
$y’=-8e^{-8x}$
Work Step by Step
$y=e^{-8x}$
let u=-8x
u'=-8
$\frac{d}{dx}e^u=e^uu'$
$=e^{-8x}(-8)$
$=-8e^{-8x}$
$y’=-8e^{-8x}$
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