document.write( "Question 1158891: x+6/x^2+x-20
\n" ); document.write( "What value or values of x are not allowed in this rational expression?
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Algebra.Com's Answer #781861 by solver91311(24713)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( "Take the denominator function and set it equal to zero.\r
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\n" ); document.write( "\n" ); document.write( "Solve the quadratic.\r
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\n" ); document.write( "\n" ); document.write( "The two values obtained are the two values that make the rational expression undefined because if either value is substituted for x, the denominator of the rational function becomes zero.
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\n" ); document.write( "John
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\n" ); document.write( "My calculator said it, I believe it, that settles it
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