document.write( "Question 446221: if x/y+y/x=-1,then x3-y3=? \n" ); document.write( "

Algebra.Com's Answer #307701 by robertb(5830) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"x%2Fy+%2B+y%2Fx+=+-1\"$
\n" ); document.write( "<==> $\"%28x%5E2+%2B+y%5E2%29%2F%28xy%29+=+-1\"$
\n" ); document.write( "<==> $\"x%5E2+%2B+y%5E2+=+-xy\"$ ==> $\"x%5E2+%2B+xy+%2B+y%5E2+=+0\"$ \r
\n" ); document.write( "\n" ); document.write( "==> $\"x%5E3+-+y%5E3+=+%28x-y%29%28x%5E2+%2B+xy++%2B+y%5E2%29+=+%28x-y%29%2A0+=+0\"$ \n" ); document.write( "

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