document.write( "Question 521373: what is the factor of binomial 9x^4-81y^2 \n" ); document.write( "
Algebra.Com's Answer #346461 by mananth(16946)\"\" \"About 
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9x^4-81y^2\r
\n" ); document.write( "\n" ); document.write( "(3x^2)^2-(9y)^2\r
\n" ); document.write( "\n" ); document.write( "(3x^2+9y)(3x^2-9y)\r
\n" ); document.write( "\n" ); document.write( "3*3(x^2+3y)(x^2-3y)
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