Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Appendix A - Review - A.10 Internal Notation; Solving Inequalities - A.10 Assess Your Understanding - Page A87: 14


Interval Notation: $(-\infty,0]$ Inequality Form: $ x\leq 0$.

Work Step by Step

Since the bracket notation is closed at $0$ and the direction goes to negative infinity, then the interval is $(-\infty,0]$. In terms of inequality, we have $ x\leq 0$.
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