Integration substitution rule help

[p.mather]

Homework Statement

∫ x^(1/4) . (x^(5/4) +1)^6

Homework Equations

I used substitution rule with u = x^(5/4) +1

The Attempt at a Solution

I got an answer of

4/5 . (u^7/7) +c would that be correct

 

[gb7nash]

Convert u back to x and take the derivative. Is it correct?