Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 1 - Section 1.4 - Adding Real Numbers - Exercise Set: 67



Work Step by Step

The absolute value of a real number $a$, denoted by $|a|$, is the distance between $a$ and 0 on a number line. Therefore, $|a|=a$ if $a\gt0$, and $|a|=-a$ if $a\leq0$. Also, if $a$ is a number, then $-(-a)=a$. Therefore, $|-2|=-(-2)=2$, and $-|-2|=-(2)=-2$.
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