document.write( "Question 762650: if x+y=7*2 and xy =5*2 find x-y \n" ); document.write( "
Algebra.Com's Answer #464328 by tommyt3rd(5050)\"\" \"About 
You can put this solution on YOUR website!
\"%0D%0A%28x-y%29%5E2+=+x%5E2+-+2+xy+%2B+y%5E2%0D%0A\"\r
\n" ); document.write( "\n" ); document.write( "\"%0D%0A%28x%2By%29%5E2+=+x%5E2+%2B+2+xy+%2B+y%5E2%0D%0A\"\r
\n" ); document.write( "\n" ); document.write( "subtracting...
\n" ); document.write( "\"%0D%0A%28x-y%29%5E2-%28x%2By%29%5E2+=+-4xy+%0D%0A\"\r
\n" ); document.write( "\n" ); document.write( "and so...\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"%0D%0A%28x-y%29%5E2+=%28x%2By%29%5E2+-4xy+=+%2814%2B10%29%5E2-4%2814%29%2810%29=16%0D%0A\"\r
\n" ); document.write( "\n" ); document.write( "So x-y=4\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( ":)\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );