Hi everyone,

I am trying to integrate the following expression:

(where "u" is it should read " " but I couldn't get the LaTex maths thing to work, sorry)

using the given substitution

Please can anyone offer a way to do this? I get to the stage where I have:

(where "a" is it should read "u(u-4)")

but I can't get any further. Any help would be much appreciated.