document.write( "Question 1041607: if x + y = 12 and x - y = 1/3, then x^2 -y^2 = \n" ); document.write( "

Algebra.Com's Answer #656558 by ikleyn(52793) $\"\"$ $\"About$

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document.write( "Do you know this identity\r\n" );
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document.write( "(x+y)*(x-y) = .\r\n" );
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document.write( "It is valid for all real numbers x and y.\r\n" );
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document.write( "If you don't know it or if you are not sure, see the lesson The difference of squares formula in this site.\r\n" );
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