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

b.

#### Work Step by Step

$\displaystyle \lim_{x\rightarrow 4^{-}}f(x)=\lim_{x\rightarrow 4^{+}}f(x)=6,\ \ \ \$ so both the limits from the left and from the right exist, and, they are equal, which means that $\displaystyle \lim_{x\rightarrow 4}f(x)$ exists and $\displaystyle \lim_{x\rightarrow 4}f(x)=6$.

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