Precalculus (6th Edition) Blitzer

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

Chapter 2 - Section 2.7 - Polynomial and Rational Inequalities - Exercise Set - Page 413: 49

Answer

$(-\infty,-\frac{4}{3})\cup[2,\infty)$

Work Step by Step

Step 1. Rewrite the inequality as $\frac{2(x-2)}{3(x+4/3)}\geq0$; the boundary points are $x=-4/3,2$ Step 2. Using test points to examine signs across the boundary points, we have $...(+)...(-4/3)...(-)...(2)...(+)...$ Thus the solutions are $x\lt-\frac{4}{3}$ or $x\geq2$ Step 3. We can express the solutions on a real number line as shown in the figure. Step 4. We can express the solutions in interval notation as $(-\infty,-\frac{4}{3})\cup[2,\infty)$
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