SOLUTION: what is this factor completely x^4 y^3-81y^3

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Question 338712: what is this factor completely x^4 y^3-81y^3
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
x^4 y^3-81y^3
..
y%5E3%28x%5E4-81%29
y%5E3%28%28x%5E2%29%5E2-%289%29%5E2%29
%28y%5E3%28x%2B9%29%28x-9%29%29