#### Answer

$x=-9$ or $x=2$

#### Work Step by Step

A rational expression is undefined when the value of its denominator is zero. Write and solve an expression where the denominator is zero.
$(x+9)(x-2)=0$
A product is zero when either factor is zero.
$x+9=0$ or $x-2=0$
Use the addition property of equality to solve both equations for x.
$x+9-9=0-9$ or $x-2+2=0+2$
Simplify.
$x=-9$ or $x=2$