document.write( "Question 1187306: f(x)= x+7/ x^2-3x-40\r
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Algebra.Com's Answer #818249 by ikleyn(52790) $\"\"$ $\"About$

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document.write( "Factor the denominator  x^2 - 3x - 40 = (x-8)*(x+5).\r\n" );
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document.write( "The roots of the denominator are 8 and -5.\r\n" );
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document.write( "So, the domain of the function is the entire number line without two points x= -5  and  x= 8.\r\n" );
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document.write( "ANSWER.  The domain is  (-oo,-5) U (-5,8) U (8,oo).\r\n" );
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