I'm attempting this question on binomial distributions:

are the first 3 terms of the series expansion of

Use this to find the 1st 3 terms of the series expansion of

This is what I've done:

1) Substituted (m+1) into the initial expansion to give the expansion for :

2) Used the binomial theorum to expand :

3) Is this along the right lines...if so where do I go from here? Or am I doing completely the wrong thing from the start?