Question

Use the binomial theorem to expand completely (2x-y)^5

Answer 1

\[(a+b)^n=\sum_{k=0}^n\binom nka^{n-k}b^k\]where\[\binom nk={n!\over k!(n-k)!}\]

Answer 2

what is n in your case?

Answer 3

yeah but they want it writen out :/

Answer 4

You could do that if you could understand the formula
which part of the formula do you not understand?