# How do you find the domain of f(x)= x +4?

Apr 30, 2017

See explanation.

#### Explanation:

The domain of a function is the largest subset of $\mathbb{R}$ for which the function's value is defined.

For the function $f \left(x\right) = x + 4$ there are no limitations, so the domain is $\mathbb{R}$.

The function could have a limited domain if it had:

• variable in the denominator of a fraction (such expression cannot be 0)

• variable in an expression under square root sign (such expression cannot be negative)