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Evaluate: int(x+1)^2\ e^x\ dx...

Evaluate: `int(x+1)^2\ e^x\ dx`

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We have given
`int(x+1)^2\ e^x\ dx`
`I=int(x^2+2x+1)e^xdx`
`I=int x^2e^xdx+int 2xe^xdx+e^xdx`
`I=int(x^2+2x)e^xdx +e^xdx`
As `int [f(x)+f'(x)]e^xdx =e^xf(x)`
`I=x^2e^x+int e^xdx`
`I=x^2e^x+e^x+c`
...
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