What is the domain of $f(x)=\frac{x+5}{sqrt{x^2$-9}$}?
(-5,+infty)
(-infty,-3)cup (3,+infty)
(3,+infty)
![(-\infty,-3]\cup 3,+\infty)
If
then find .
$\frac{-1}{2}$
$\frac{5}{2}$
.