document.write( "Question 156468: Find all numbers for which x - 1 / x^2-2x -15 is defined \n" ); document.write( "

Algebra.Com's Answer #115412 by solver91311(24713) $\"\"$ $\"About$

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The only way for $\"%28x-1%29%2F%28x%5E2-2x-15%29\"$ to be UNdefined is for the denominator to be zero, so solve $\"x%5E2-2x-15=0\"$ and your original rational function will be undefined for the two roots you obtain. The original rational function is then defined for all real numbers EXCEPT those two roots. \n" ); document.write( "

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