The domain of the function is:
x ≥ 0
Let's find the domain:
The domain is the set of possible inputs that we can have in a function. To identify the domain we need to look at the horizontal axis of the graph, and see in which interval is the graph.
We can see that the first point is at x = 0, and then the graph extends to the right (so the value of x increases)
Then the domain of the function is:
x ≥ 0