This video covers what to do if X is approaching infinity (or negative infinity) in lots of different situations: polynomial fractions, complex fractions, polynomials. I'll also show you a great trick that will cut your factoring time by 90% for these problems!
Using Limits To Find Horizontal Asymptotes
Yep, that's what we'll do. We'll also briefly review the pre-calc way of finding horizontal asymptotes of rational functions, first covered way back when in Pre-Calc.
If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)