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Find the coefficient of y^4 in the expansion of (2y-5+3y^2)^6.

 Aug 8, 2024
 #1
avatar+1853 
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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! :)

 Aug 8, 2024
edited by NotThatSmart  Aug 8, 2024

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