# Chapter 3 - The Derivative - 3.1 Limits - 3.1 Exercises: 13

please see "step by step" for explanation

#### Work Step by Step

A limit at x=a exists if 1. both one sided limits exist AND 2. they are equal ------------ In exercise 6, both the limit from the left and the limit from the right exist, and they both equal 4. Therefore $\displaystyle \lim_{x\rightarrow 2}F(x)$ exists and equals 4. In exercise 9, the left sided limit exists and equals $-1,$ the right sided limit exists and equals $-\displaystyle \frac{1}{2}$, BUT, they are not equal, so $\displaystyle \lim_{x\rightarrow-2}f(x)$ does not exist .

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