What is the derivative of $e^{- x}$ $e^(-x)$ ?

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Answer 1 · 2016-07-09T11:10:47

You have to use the chain rule

To evaluate the $(e^-x)'$ you must calculate the $(e^u)' * u'$ , where $u=-x$ . But, $(e^u)' = e^u$ , and $u'=-1$ , and then:

$(e^-x)'=e^-x * (-1)= -e^-x$

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