document.write( "Question 152567: (x+y)2+(x-3y)2= \n" ); document.write( "

Algebra.Com's Answer #112449 by orca(409) $\"\"$ $\"About$

You can put this solution on YOUR website!
First use the formula
\n" ); document.write( " $\"%28a%2Bb%29%5E2=a%5E2%2B2ab%2Bb%5E2\"$
\n" ); document.write( "and
\n" ); document.write( " $\"%28a-b%29%5E2=a%5E2-2ab%2Bb%5E2\"$
\n" ); document.write( "to expand,
\n" ); document.write( "then combine like terms.
\n" ); document.write( " $\"%28x%2By%29%5E2%2B%28x-3y%29%5E2\"$
\n" ); document.write( "= $\"x%5E2%2B2xy%2By%5E2%2Bx%5E2-2x%2A%283y%29%2B%283y%29%5E2\"$
\n" ); document.write( "= $\"x%5E2%2B2xy%2By%5E2%2Bx%5E2-6xy%2B9y%5E2\"$
\n" ); document.write( "= $\"2x%5E2-4xy%2B10y%5E2\"$
\n" ); document.write( " \n" ); document.write( "

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