document.write( "Question 474276: Factor Completely\r
\n" ); document.write( "\n" ); document.write( "81x^2 - 36y^2
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Algebra.Com's Answer #325281 by nerdybill(7384)\"\" \"About 
You can put this solution on YOUR website!
because we can rewrite:
\n" ); document.write( "81x^2 - 36y^2
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\n" ); document.write( "(9x)^2 - (6y)^2
\n" ); document.write( "It is a \"difference of squares\" (special factoring case):
\n" ); document.write( "(9x - 6y)(9x + 6y)
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