document.write( "Question 314357: Which numbers cannot be used in place of the variable in the rational expression?\r
\n" ); document.write( "\n" ); document.write( "3x/x^2-49 \n" ); document.write( "

Algebra.Com's Answer #224915 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"%283x%29%2F%28x%5E2-49%29=3x%2F%28%28x-7%29%28x%2B7%29%29\"$
\n" ); document.write( "Two values are not allowed.
\n" ); document.write( " $\"x=7\"$ and $\"x=-7\"$ .
\n" ); document.write( "They are not allowed since then you would have a division by zero which is undefined. \r
\n" ); document.write( "\n" ); document.write( " $\"+graph%28+300%2C+300%2C+-10%2C+10%2C+-3%2C+3%2C+3x%2F%28x%5E2-49%29x-2%29+\"$ \n" ); document.write( "

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