CPM Homework Help : PC Problem 5-49

What is the difference between the following two expressions: $\lim\limits_{x\rightarrow-2}f(x)$ and $\lim\limits_{x\rightarrow2^-}f(x)$ ?

Answer:

In the first, the limit is approaching $−2$ from both sides, and in the second, the limit is approaching $2$ from the left side.