## Precalculus (6th Edition) Blitzer

Not a function Domain = $\left\{1, 2\right\}$ Range = $\left\{-6, 4, 6\right\}$
The first coordinate $2$ is paired with two different second coordinates, therefore the relation is NOT a function. The domain is the set that contains the first components so: Domain = $\left\{1, 2\right\}$ The range is the set that contains all the second components so: Range = $\left\{-6, 4, 6\right\}$