what is the domain and range of the following:

Question

what is the domain of f(x) = 8x − 9 and  f^-1(x) = x+9/8

Answer 1

The domain are all of the values of the independent variable for which the function has meaning.

For both functions all real number, ℜ, give meaning to the function. 

The domain for both is the set of real numbers, ℜ.