Question

Determine whether the graph is that of a function by using the vertical-line test. If it is, use the graph to find

Answer 1

The graph belongs to a function, a quadratic function.

The domain is Real numbers:

$(-\infty,\infty)$

and the range is

$\begin{gathered} y\ge-4 \\ or\text{ (-4, }\infty) \end{gathered}$