Answer:
Set of all real numbers.
Explanation:
Here, the given function,
f(x) = Negative five-sixths (three-fifths) Superscript x
Since, it is an exponential function,
We know that,
An exponential function is defined for every real number,
Thus, f(x) will also defined for all real numbers,
That is,
Domain of f(x) = Set of all real numbers.