## Intermediate Algebra for College Students (7th Edition)

Not a function. Domain: $\{-2,-1,0,1,2\}.$ Range: $\{-2,-1,1,3\}.$
The Vertical Line Test says that every vertical line drawn can only intersect the graph in at most one point for the graph to represent a function. Here this fails at $x=-1$, hence it is not a function. Domain: $\{-2,-1,0,1,2\}.$ Range: $\{-2,-1,1,3\}.$