document.write( "Question 529381: (6x^2-7xy+y^2)+(-9x^2-9xy-y^2)+(x^2+xy-4y^2) \n" ); document.write( "

Algebra.Com's Answer #349577 by Maths68(1474) $\"\"$ $\"About$

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= $\"%286x%5E2-7xy%2By%5E2%29%2B%28-9x%5E2-9xy-y%5E2%29%2B%28x%5E2%2Bxy-4y%5E2%29\"$
\n" ); document.write( "= $\"6x%5E2-7xy%2By%5E2-9x%5E2-9xy-y%5E2%2Bx%5E2%2Bxy-4y%5E2%29\"$
\n" ); document.write( "= $\"6x%5E2%2Bx%5E2-9x%5E2%2By%5E2-y%5E2-4y%5E2-9xy-7xy%2Bxy%29\"$ [Combine like terms]
\n" ); document.write( "= $\"7x%5E2-9x%5E2%2Bcross%28y%5E2%29-cross%28y%5E2%29-4y%5E2-16xy%2Bxy%29\"$
\n" ); document.write( "= $\"-2x%5E2-4y%5E2-15xy%29\"$
\n" ); document.write( "= $\"-%282x%5E2%2B4y%5E2%2B15xy%29\"$ \r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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