Algebra and Trigonometry 10th Edition

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



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: $|-4|=|4|$
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