Answer
See the graph below.
Applying the absolute value to $ f_1$ extends its domain for $ x\lt0$, which was not available.
Work Step by Step
Given above.
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 - Practice Exercises - Page 37: 47
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