Answer
$L(x)=-x+1$
Work Step by Step
$f(x)=e^{-x}$,
$L(x)=f(a)+f'(a)(x-a)$
$f'(x)=-e^{-x}$
$x_{0}=0$
$f(0)={e^0}=1$
$f'(0)=-e^{-0}=-1$
then $L(x)=1-1(x-0)=-x+1$
$L(x)=-x+1$
Thus, the final answer is: $L(x)=-x+1$
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