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Multiply: (3x+3y)^2 (2x+3y)
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in this equation, do i use the FOIL method?
(3x+3y) (3x+3y) (2x+3y)
\[(x+y)^2=x^2+2xy+y^2\]
18 x^3+63 x^2 y+72 x y^2+27 y^3
\[(3x+3y)^2=?\]
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cjm, what step do I do next?
if you need only answer http://www.wolframalpha.com/input/?i=%283x%2B3y%29%5E2+%282x%2B3y%29
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