Answer
The domain is $(-\infty, \infty)$.
Work Step by Step
There is a y for every x of the graph; therefore, the domain is $(-\infty, \infty)$.
The picture is provided below.
Thomas' Calculus 13th Edition
by Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0-32187-896-5
ISBN 13:
978-0-32187-896-0
Chapter 1: Functions - Section 1.1 - Functions and Their Graphs - Exercises 1.1 - Page 12: 15
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