Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter P - Section P.9 - Linear Inequalities and Absolute Value Inequalities - Exercise Set - Page 138: 87

Answer

$(-\infty,1/3)\cup(1,\infty)$

Work Step by Step

Rewrite as $|2-3x| \gt 1$ ... also, $|a-b|=|b-a|$ $|3x-2| \gt 1$ ... $|u| \gt c $ is equivalent to ($ u\lt -c $) or ($ u\gt c $) $ \begin{array}{lllll} 3x-2\lt-1 & /+2 & ...or... & 3x-2\gt 1 & /+2\\ 3x\lt 1 & /\div 3 & & 3x\gt 3 & /\div 3\\ x\lt 1/3 & & & x \gt 1 & \\ x\in(-\infty,1/3) & & or & x\in(1,\infty) & \\ & & & & \end{array} $ Solution set: $(-\infty,1/3)\cup(1,\infty)$
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