## Precalculus (6th Edition) Blitzer

(b) The given function is: f\left( x \right)=\left\{ \begin{align} & 2x\text{ if }x\le 0 \\ & \text{2 if }x>0 \end{align} \right. This function constitutes of 2 straight lines, one of them being parallel to the x-axis. As can be seen from the graph, the range of the function is $\left( -\infty ,0 \right]\cup \left\{ 2 \right\}$.