Determine the intervali$($s$)$ on which fre following function is continuous.

$f(x)=\frac{x^2-8x+15}{x^2-9}$

The function is continuous on the interval$/$a$)$Determine the intervali$($s$)$ on which fre following function is continuous.

$f(x)=\frac{x^2-8x+15}{x^2-9}$

The function is continuous on the interval$/$a$)$