This one seems a lot harder...
Find the power series about the origin of:
z^2/(4-z)^2
You only need to bother calculating the series for 1/(4 - z)^2 (why?).
Did you bother to read the link I gave in my reply here: http://www.mathhelpforum.com/math-he...er-series.html
Now look for the pattern in where n = 0, 1, 2, 3, ....
If you need more help, please say where you are stuck.