College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 1, Equations and Graphs - Section 1.8 - Solving Absolute Value Equations and Inequalities - 1.8 Exercises - Page 153: 47


Interval: $(- \frac{15}{2},\ -7)\cup\ (-7,\ -\frac{13}{2})$

Work Step by Step

$\frac{1}{|x+7|}\gt 2$ We can see that $x\neq -7$ because otherwise we would have division by 0. $1\gt 2|x+7|$ $\frac{1}{2}\gt |x+7|$ $|x+7|\lt \frac{1}{2}$ $-\frac{1}{2}\lt x+7\lt \frac{1}{2}$ $-\frac{15}{2}\lt x\lt -\frac{13}{2}$ We use interval notation and skip $x=-7$: Interval: $(- \frac{15}{2},\ -7)\cup\ (-7,\ -\frac{13}{2})$
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