document.write( "Question 519343: Please help me multiply this expression. (3x+3y)^2(2x+3y). I did the () first and got (9x^2+9y^2)(2x+3y). If I use the FOIL method then there are mixed variables. My confusion is now what do I do? \n" ); document.write( "
Algebra.Com's Answer #345584 by ankor@dixie-net.com(22740)\"\" \"About 
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(3x+3y)^2*(2x+3y)
\n" ); document.write( "First FOIL
\n" ); document.write( "(3x + 3y)* (3x + 3y) = 9x^2 + 9xy + 9xy + 9y^2
\n" ); document.write( "Combine like terms and you have
\n" ); document.write( "9x^2 + 18xy + 9y^2
\n" ); document.write( ":
\n" ); document.write( "Multiply this by (2x+3y), but do it this way, long multiplication
\n" ); document.write( "9x^2 + 18xy + 9y^2
\n" ); document.write( ". . . . . . . . . 2x + 3y
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\n" ); document.write( ":
\n" ); document.write( "You should get: 18x^3 + 63x^y + 72xy^2 + 27y^3
\n" ); document.write( "Corrected to: 18x^3
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