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: 61

Answer

$(-1,7)$

Work Step by Step

The solutions of $|u| \lt c $ are the numbers that satisfy $-c \lt u \lt c.$ The idea is to isolate $x$ in the middle. Adding, subtracting or multiplying/dividing with a positive number preserves order (the inequality symbols remain). Multiplying/dividing with a negative number inverts the order (the inequality symbols changes). --- $|2x-6| \lt 8$ is equivalent to: $-8 \lt 2x-6 \lt 8 \qquad $ ... add 6 $-2 \lt 2x \lt 14\qquad $ ... divide with 2 $-1 \lt x \lt 7$ Both interval borders are excluded from the interval. The solution set is $(-1,7)$ .
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