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: 3


$a=20$ and $b=-43$

Work Step by Step

$|a+b|=|20+(-43)|=|-23|=23$. $|a|+|b|=|20|+|-43|=20+43=63$. So: $|a+b|\lt|a|+|b|$
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