Question

What is the domain and range of `f(x)=3^x`?

Answer 1

See explanation.

Explanation:

The domain is the maximum subset of `RR`, for which the function's value can be calculated.
Any number can be an exponent of a power, so the domain is

`D=RR`

The range is the set of all values taken by the function.

If you rise `3` to any real power, the result is always greater than zero, so the range is:

`R=(0;+oo)`