Chapter 4 - Section 4.6 - Applications and Models of Exponential Growth and Decay - Summary Exercises on Functions: Domains and Defining Equations - Page 463: 3

$(-\infty, \infty)$

The graph of the given function, $ f(x)=|x+4| ,$ is a V-shaped line where there are no restrictions for the $x-$values. Hence, the domain is \begin{array}{l}\require{cancel} (-\infty, \infty) .\end{array}