Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 1-14 - Cumulative Review - Final Exam - Page 930: 46

Answer

$-2\le x\le3$

Work Step by Step

Since $|x|\le a$ (where $a$ is a positive constant) implies $-a\le x\le a,$ the given inequality, $ |2x-1|\le5 ,$ is equivalent to \begin{align*} -5\le &2x-1\le5 .\end{align*} Using the properties of inequality, the inequality above is equivalent to \begin{align*}\require{cancel} -5+1\le &2x-1+1\le5+1 \\ -4\le &2x\le6 \\\\ -\dfrac{4}{2}\le &\dfrac{\cancel2x}{\cancel2}\le\dfrac{6}{2} \\\\ -2\le &x\le3 .\end{align*} Hence, the solution to the inequality $|2x-1|\le5$ is $-2\le x\le3$.
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