document.write( "Question 855785: find all numbers that must be excluded from the domain of the following rational expression. x+5/x^2+8x+7 \n" ); document.write( "

Algebra.Com's Answer #516075 by Fombitz(32388) $\"\"$ $\"About$

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Numbers must be excluded if they make the denominator zero since division by zero is undefined.
\n" ); document.write( " $\"x%5E2%2B8x%2B7=0\"$
\n" ); document.write( " $\"%28x%2B1%29%28x%2B7%29=0\"$
\n" ); document.write( "Two solutions:
\n" ); document.write( " $\"x%2B1=0\"$
\n" ); document.write( " $\"x=-1\"$
\n" ); document.write( "and
\n" ); document.write( " $\"x%2B7=0\"$
\n" ); document.write( " $\"x=-7\"$
\n" ); document.write( " \n" ); document.write( "

\n" );