`int_1^3 e^x(x+1)dx`

Explanation

`int_1^3 e^x(x+1)dx`
[Integrating by parts choosing (x+1) as first and `e^x`as second function]
`[[(x+1)e^x]-inte^xdx]_1^3`
`=[x*e^x+e^x-e^x]_1^3`
`=[x*e^x]_1^3`
`=3e^3-e`