Question 1134817
How do you simplify -e^(-2x)-e^(-x)?
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"Simplified" can be a matter of opinion.

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-e^(-2x)-e^(-x)
= {{{-1*(e^(-2x) + e^(-x))}}}
= {{{-1*e^(-x)*(e^(-x) + 1)}}}
= {{{-1*e^(-2x)*(e^(x) + 1)}}}
= {{{-(e^(x) + 1)/(e^(2x)))}}}
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You pick it.