Question

How do you find the domain of `7x+4`?

Answer 1

`x in RR`

Explanation:

The domain of a function is where the function is defined in terms of real numbers.

Typical examples of things that might cause functions to not be defined in terms of real numbers are square roots, logarithms, dividing by zero and so on.

In this case, `7x+4` has none of that (and a general rule is that polynomials are always defined in terms of real numbers), so the domain is simply all real numbers, `x in RR`