# Math Help - Finding Asymptotes

1. ## Finding Asymptotes

How do I find the asymptotes for f(x)=(x^5)-15x^3?
Also, for f(x)=(x^2)(e^(-x))
Do I find the limits of x approaching +/- infinity?

2. Originally Posted by Jiyongie
How do I find the asymptotes for f(x)=(x^5)-15x^3?
Also, for f(x)=(x^2)(e^(-x))
Do I find the limits of x approaching +/- infinity?
1. The 1st function doesn't have any asymptotes.

2. Since $\lim_{x \to +\infty}\left(e^{-x}\right) = 0$ you'll get the asymptote y = 0 if x approaches $+\infty$.

There doesn't exist an asymptote if x approaches $-\infty$.