Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 4 - Polynomial and Rational Functions - 4.4 Polynomial and Rational Inequalities - 4.4 Assess Your Understanding - Page 219: 57

Answer

$(-\infty,-\frac{2}{3})U(0,\frac{3}{2})$

Work Step by Step

Step 1. Rewrite the inequality as $6x-5-\frac{6}{x}\lt0$ or $\frac{(2x-3)(3x+2)}{x}\lt0$. Identify boundary points (zeros and asymptotes) as $x=-\frac{2}{3},0, \frac{3}{2}$ which divide the x-axis into four intervals $(-\infty,-\frac{2}{3}),(-\frac{2}{3},0),(0,\frac{3}{2}),(\frac{3}{2},\infty)$ Step 2. Choose test values in each interval $x=-1,-\frac{1}{3},1,2$ and test the inequality to get $True,\ False,\ True,\ False$ Step 3. Thus the solution intervals are $(-\infty,-\frac{2}{3})U(0,\frac{3}{2})$
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