Well after isomorphism helped get me sorted out the other day I thought I had these Binomials licked BUT!!!!

When I tried this one I couldn't seem to get the right answer

Find the term x^44 in the following

(x^2 - 1/sq root x)^27

So thought I was doing well getting

this as the general term

(27 over r) ( x^2n-2r ) . (-x^-1/2r)

and the solving for r ie 5/2r = 27 but then of course r works out really ugly.

If someone prepared to have a go at helping I would be grateful