Find the coefficient of y^4 in the expansion of (2y-5+3y^2)^6.
Here's the entire expansion (I have no life)
\(729y^{12}+2916y^{11}-2430y^{10}-19980y^{9}+135y^{8}+59976y^{7}+6364y^{6}-99960y^{5}+375y^{4}+92500y^{3}-18750y^{2}-37500y+15625\)
The answer is 375
Thanks! :)
+1804 
