Question

what is the domain of the graph shown?
$(-infty, 4)$
$(0, 4)$
$(-4, 4)$
$(-infty, infty)$

Explanation:

Step1: Define domain

The domain is all valid $x$-values for the graph.

Step2: Analyze graph arrows

The left arrow extends left infinitely ($x\to-\infty$), and the right arrow extends right infinitely ($x\to\infty$).

Answer:

$(-\infty, \infty)$