Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Practice Final Exam - Page 705: 21

Answer

$x=\left\{ \dfrac{2}{3}, 1\right\}$

Work Step by Step

Isolating the absolute value expression, the given expression, $ |6x-5|-3=-2 ,$ is equivalent to \begin{array}{l}\require{cancel} |6x-5|=-2+3 \\\\ |6x-5|=1 .\end{array} Since for any $a$ greater than zero, $|x|=a$ implies $x=a$ OR $x=-a$, then \begin{array}{l}\require{cancel} 6x-5=1 \\\\ 6x=1+5 \\\\ 6x=6 \\\\ x=\dfrac{6}{6} \\\\ x=1 ,\\\\\text{OR}\\\\ 6x-5=-1 \\\\ 6x=-1+5 \\\\ 6x=4 \\\\ x=\dfrac{4}{6} \\\\ x=\dfrac{\cancel{2}\cdot2}{\cancel{2}\cdot3} \\\\ x=\dfrac{2}{3} .\end{array} Hence, $ x=\left\{ \dfrac{2}{3}, 1\right\} .$
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