Answer
See graph.
domain $\{x|x\ne\frac{k\pi}{2}\}$ (where $k$ is an odd integer), range $(-\infty,\infty)$.
Work Step by Step
Step 1. See graph for $y=3tan(x)$.
Step 2. Based on the graph, we can determine the domain as $\{x|x\ne\frac{k\pi}{2}\}$ (where $k$ is an odd integer), and range as $(-\infty,\infty)$.