Calculus with Applications (10th Edition)

Published by Pearson
ISBN 10: 0321749006
ISBN 13: 978-0-32174-900-0

Chapter R - Algebra Reference - R.5 Inequalities - R.5 Exercises - Page R-21: 9



Work Step by Step

The $''(-\infty,...'' $indicates that this interval contains numbers that can be negative and unbounded in magnitude (so there is no left endpoint). At the same time, they are less or equal to $-1$, since the bracket on the right indicates that the right endpoint is included.. In less words, these are numbers that are less than or equal to $-1$. For a number x from this interval, we can write $x\leq-1$
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