[SOLVED] Binomial expansion problem

I'm having problem with my revision sheets - Any help would be much appreciated...

(i) Write down the general term in the power series expansion of

((x^2) - (2/x))^18

WHAT IS THE GENERAL TERM AND HOW WOULD I GO ABOUT THIS?

Hence find the term which is independant of x

I DONT KNOW WHAT THIS MEANS

(ii)Find the first four terms in the expansion of (1+x)^16 in ascending powers of x.

hence expand (1 + z + z^2) in ascending powers of z up to and including the term in z^3

DO YOU FACTORISE THIS AND RAISE BOTH PARENTHESIS TO THE POWER 16??