Question 303237
Simplify first.
{{{(x^2-9)/(x^2+3x-18)=((x+3)(x-3))/((x+6)(x-3))}}}
{{{(x^2-9)/(x^2+3x-18)=((x+3)cross(x-3))/((x+6)cross(x-3))}}}
{{{(x^2-9)/(x^2+3x-18)=(x+3)/(x+6)}}}

The expression is undefined when the denominator equals zero.
{{{x+6=0}}}
{{{x=-6}}}
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The correct answer is not available as a choice. 
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{{{ graph( 300,300, -10, 10, -10, 10, (x^2-9)/(x^2+3x-18)) }}}