Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 1 - Review Exercises - Page 131: 38

Answer

$\left( \infty,-3 \right]$

Work Step by Step

$\bf{\text{Solution Outline:}}$ To solve the given inequality, $ -5x-4\ge11 ,$ use the properties of inequality. For the interval notation, use a parenthesis for the symbols $\lt$ or $\gt.$ Use a bracket for the symbols $\le$ or $\ge.$ $\bf{\text{Solution Details:}}$ Using the properties of inequality, the inequality above is equivalent to \begin{array}{l}\require{cancel} -5x\ge11+4 \\\\ -5x\ge15 .\end{array} Dividing all sides by a negative number (and consequently reversing the sign), the inequality above is equivalent to \begin{array}{l}\require{cancel} x\le\dfrac{15}{-5} \\\\ x\le-3 .\end{array} In interval notation, the solution set is $ \left( \infty,-3 \right] .$
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