document.write( "Question 590909: Can someone please explain to me how to do this problem?\r
\n" ); document.write( "\n" ); document.write( "(9x^2-xy+y^2)+ (-x^2-8xy+9y^2) \n" ); document.write( "

Algebra.Com's Answer #375348 by jim_thompson5910(35256) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"%289x%5E2-xy%2By%5E2%29%2B+%28-x%5E2-8xy%2B9y%5E2%29\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"9x%5E2-xy%2By%5E2-x%5E2-8xy%2B9y%5E2\"$ Remove unneeded parenthesis\r
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\n" ); document.write( "\n" ); document.write( " $\"%289x%5E2-x%5E2%29%2B%28-xy-8xy%29%2B%28y%5E2%2B9y%5E2%29\"$ Group like terms\r
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\n" ); document.write( "\n" ); document.write( " $\"8x%5E2-9xy%2B10y%5E2\"$ Combine like terms\r
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\n" ); document.write( "\n" ); document.write( "So $\"%289x%5E2-xy%2By%5E2%29%2B+%28-x%5E2-8xy%2B9y%5E2%29\"$ fully simplifies to $\"8x%5E2-9xy%2B10y%5E2\"$ \r
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