Question

What is the domain and range of `f(x)= 4`?

Answer 1

Domain: `(-oo, + oo)`
Range: `{4}`

Explanation:

You're dealing with a constant function for which the output, i.e. the value of the function, is always constant regardless of the input, i.e. the value of `x`.

In your case, the function is defined for any value of `x in RR`, so its domain will be `(-oo, + oo)`.

Furthermore, for any value of `x in RR`, the function is always equal to `4`. This means that the range of the function will be that one value, `{4}`.

graph{y - 4 = 0.001 * x [-15.85, 16.19, -4.43, 11.58]}