Answer
$=$
Work Step by Step
$|x|=x$ if $x\geq0$
$|x|=-x$ if $x\lt0$
Given that $-4\lt0$:
$|-4|=-(-4)=4$
Given that $4\geq0$:
$|4|=4$
Hence: $|-4|=|4|$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Prerequisites - P.1 - Review of Real Numbers and Their Properties - Exercises - Page 12: 39
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