The first thing I would do is let u= 2.2/x. Then as x goes to infinity, u goes to 0 and the limit becomes .
Now apply L'hopital's rule.
Slight typo here, so to fix this up (and show an alternate solution):
The fourth line uses the limit law that states the limit of a product is equal to the product of the limits, and the fact that you should have been taught already that .