Answer
See graph.
Domain: $\{-2\}$
Range: $(-\infty,\infty)$
Work Step by Step
First we solve $2x+4=0$:
$2x+4=0$
$2x=-4$
$x=-2$
We graph $x=-2$ by recognizing that it represents a vertical line through the point $(-2,0)$. See graph for result.
Since the graph is a vertical line, we know that the domain is restricted to $-2$, while the range is all real numbers:
Domain: $\{-2\}$
Range: $(-\infty,\infty)$