document.write( "Question 154639: consider the problem x-8/ x +5 divided by x -9/ x + 4. Explain why -5,9,and -4 are not allowable replacement for variable x. \n" ); document.write( "

Algebra.Com's Answer #113879 by Earlsdon(6294) $\"\"$ $\"About$

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Divide:
\n" ); document.write( " $\"%28x-8%29%2F%28x%2B5%29\"$ by $\"%28x-9%29%2F%28x%2B4%29\"$ Invert the second fraction and multiply.
\n" ); document.write( " $\"%28%28x-8%29%2F%28x%2B5%29%29%2A%28%28x%2B4%29%2F%28x-9%29%29\"$
\n" ); document.write( "If you substitute any of the values, -5, 9, or, in the given expression, -4, you will end up with a fraction whose denominator is zero.
\n" ); document.write( "This means that you will be dividing by zero and, as you know, division by zero is undefined and thus not allowed. \n" ); document.write( "

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