Question 119526
{{{(2x+9)/((x-5)(x+9))}}}
The expression is undefined whenever the denominator equals zero because division by zero is undefined.
{{{(x-5)(x+9)=0}}}
if 
{{{(x-5)=0}}}
{{{x=5}}}
or if
{{{(x+9)=0}}}
{{{x=-9}}}