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April 20, 2014

April 20, 2014

Posted by **matrix school 2** on Thursday, August 6, 2009 at 3:05pm.

~(e^x + x)^2 (e^x + 1)dx

can you pls explain how it arrive to this?

ans = 2e^4x + C

- integral -
**Marth**, Thursday, August 6, 2009 at 3:24pmintegral( (e^x+ x)^2 * (e^x + 1) dx )

let u = e^x + x

du = (e^x + 1)dx

Now you have integral(u^2 du)

= (u^3)/3 +C

= ((e^x + x)^3)/3 +C

= (e^3x + 3x*e^2x + 3x^2*e^x + x^3)/3 +C

Are you looking at the right answer key?

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