Answer
$\frac{2}{3}(1-e^x)^{\frac{3}{2}}+C$
Work Step by Step
$\int (e^x)(\sqrt{1-e^x})dx$
let $ 1-e^x=u$
$-e^{x}$ $dx=du$
$\int (e^x)(\sqrt{1-e^x})dx$
$=-\frac{2}{3}u^{\frac{3}{2}}+C$
$=\frac{2}{3}(1-e^x)^{\frac{3}{2}}+C$
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