Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Chapter 1 - Precalculus Review - 1.1 Real Numbers, Functions, and Graphs - Preliminary Questions - Page 9: 2


Nonnegative numbers: $a\geq0$. Nonpositive numbers: $a\leq0$. Nonnegative numbers: $a\geq0$.

Work Step by Step

Examples: $|5|=5$, $|-5|=5$, $|-0|=|0|=0$. Notice that: $|-a|=|a|$.
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