document.write( "Question 574494: find all numbers for which the rational expression is undefined.
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Algebra.Com's Answer #369100 by reviewermath(1029)\"\" \"About 
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Equate the denominator to zero, because when denominator is zero the rational expression is undefined.
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\n" ); document.write( "\n" ); document.write( "Answer: 6, -6
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