What is the integral of (x-1)e^{-x} ?

The integral of (x-1)e^{-x} is -e^{-x}x+C

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integral of (x-1)e^{-x}

\int (x - 1) e^{- x} d x

- e^{- x} x + C

Solution steps

\int (x - 1) e^{- x} d x

Apply Integration By Parts

= - e^{- x} (x - 1) - \int - e^{- x} d x

\int - e^{- x} d x = e^{- x}

= - e^{- x} (x - 1) - e^{- x}

Simplify

- e^{- x} (x - 1) - e^{- x} : - e^{- x} x

= - e^{- x} x

Add a constant to the solution

= - e^{- x} x + C