Chapter 2.4, Problem 159E

In the following exercises, suppose $y=f\left(x\right)$ is defined for all x. For each description, sketch a graph with the indicated property.

159. Discontinuous at x = 1 $\underset{x\to -1}{\lim }f\left(x\right)=-1$ and $\underset{x\to 2}{\lim }f\left(x\right)=4$