<h3>Answer: all real numbers greater than or equal to -3</h3>
Explanation:
The left-most point is at (-3,-2). The x coordinate is all we're concerned with here. The x coordinate for this point is x = -3. This is the smallest x value possible as an input. We cannot have x = -4 as that is nowhere on the blue curve.
So the domain is the set of real numbers x such that x is -4 or larger
In set builder notation, that would look like
In interval notation, we would say to indicate to the reader "have an interval from -3 to positive infinity; include the endpoint -3"