what is the domain of this exponential function?

Explanation:

Step1: Recall domain definition

The domain of a function is the set of all possible input - values (x - values).

Step2: Analyze exponential function graph

For an exponential function, there are no restrictions on the x - values. The graph extends infinitely to the left and right.

Answer:

All real numbers, or $(-\infty,\infty)$