# How do you find the horizontal asymptote for (x+3)/(x^2-9)?

Since the degree (highest power) of the denominator (bottom) is greater than the degree of the numerator (top), the unique horizontal asymptote is $y = 0$, which is the $x$-axis. This means ${\lim}_{x \to \pm \infty} f \left(x\right) = 0$.