# Vertical/Horizontal Asymptotes

## Homework Statement

Find the Vertical and horizontal asymptotes of this function

f(x)=(4x^2+25)/(x^2+9)

## The Attempt at a Solution

I think that the horizontal asym. is y=4
But the Vertical if (x^2+9)=0 then x is an imaginary number. So is the asym. (3i) or does the asym not exist?

Dick