document.write( "Question 107517This question is from textbook Intermediate Algebra
\n" ); document.write( ": Please help me find all numbers for which the rational expression is not defined. x^2-3x-4 over x^2-18x+77. Thank you \n" ); document.write( "
Algebra.Com's Answer #78325 by ankor@dixie-net.com(22740)\"\" \"About 
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Please help me find all numbers for which the rational expression is not defined. x^2-3x-4 over x^2-18x+77.
\n" ); document.write( ":
\n" ); document.write( "\"%28x%5E2-3x-4%29%2F%28x%5E2-18x%2B77%29\"
\n" ); document.write( ":
\n" ); document.write( "The expression is undefined when the denominator = 0
\n" ); document.write( "Find the values of x which make the expression \"x%5E2+-+18x+%2B+77\" = 0
\n" ); document.write( ":
\n" ); document.write( "\"x%5E2+-+18x+%2B+77\" = 0
\n" ); document.write( "Factors to
\n" ); document.write( "(x - 11)(x - 7) = 0
\n" ); document.write( "x = +11
\n" ); document.write( "and
\n" ); document.write( "x = +7
\n" ); document.write( ":
\n" ); document.write( "Substituting these two values for x; makes the denominator = 0; hence undefined \n" ); document.write( "
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