Answer
$x=-4$ or $x=3$
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.
$x^2+x-12=0$
A product is zero when either factor is zero. Factor the trinomial.
$(x+4)(x-3)$
Solve each factor for zero.
$x+4=0$ or $x-3=0$
Use the addition property of equality to solve both equations for x.
$x+4-4=0-4$ or $x-3+3=0+3$
Simplify.
$x=-4$ or $x=3$
