document.write( "Question 335286: I need to say what is wrong with this statement:\r
\n" ); document.write( "\n" ); document.write( " $\"+sqrt%28x%5E2%2By%5E2%29+=+x%2By+\"$ \r
\n" ); document.write( "\n" ); document.write( "Would it be that it should be = $\"+x%5E2%2By%5E2+\"$ ?\r
\n" ); document.write( "\n" ); document.write( "Thanks for the help! \n" ); document.write( "

Algebra.Com's Answer #240317 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Square both sides.
\n" ); document.write( " $\"x%5E2%2By%5E2=%28x%2By%29%5E2\"$
\n" ); document.write( " $\"x%5E2%2By%5E2=%28x%2By%29%28x%2By%29\"$
\n" ); document.write( " $\"x%5E2%2By%5E2=x%5E2%2Bxy%2Byx%2By%5E2\"$
\n" ); document.write( " $\"x%5E2%2By%5E2=x%5E2%2B2xy%2By%5E2\"$
\n" ); document.write( " $\"2xy=0\"$
\n" ); document.write( "So the above equality only holds if either x or y or both are zero.
\n" ); document.write( "Otherwise you're missing the 2xy term.
\n" ); document.write( " $\"sqrt%28x%5E2%2B2xy%2By%5E2%29=sqrt%28%28x%2By%29%5E2%29=x%2By\"$ \n" ); document.write( "

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