Evaluate the integral:

`int xe^-x dx`

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`int xe^-x dx `

We know that:

`int xe^(ax) dx = (x/a -1/a^2)e^(ax) `

`==gt int xe^(-x) dx `

`= (x/(-1) - 1/(-1^2))e^(-x) + C `

`= (-x -1)e^-x + C `

`= -(x+1)e^(-x) + C `

`= -(x+1)/e^x + C`

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