What is the domain of f (x) = 3

Answer:all real numbers

Step-by-step explanation: f (x) = 3 means that Y is 3 for every value of X, as there's no X affected in the formula, so it will have that value always.

As there are also no restrictions, like 1/X or logX then you know that every value of X is possible to be replaced in f (x) fórmula [if there were any X in the formula, which is not the case]

Step-by-step explanation:

the domain of the function is the set of all real numbers

x ∈ R