Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 11 - Section 11.4 - Nonlinear Inequalities in One Variable - Practice - Page 796: 4

Answer

$[-5,3]$

Work Step by Step

$\frac{x-3}{x+5}\leq0$ $(x+5)*\frac{x-3}{x+5}=(x+5)*0$ $x-3=0$ $x=3$ The denominator is zero when $x=-5$ (-infinity, -5) $[-5,3]$ $[3$, infinity) Let $x=-10$, $x=0$, and $x=10$ $x=-10$ $\frac{x-3}{x+5}\leq0$ $\frac{-10-3}{-10+5}\leq0$ $\frac{-13}{-5}\leq0$ $13/5 \leq 0$ (false) $x=0$ $\frac{x-3}{x+5}\leq0$ $\frac{0-3}{0+5}\leq0$ $\frac{-3}{5}\leq0$ (true) $x=10$ $\frac{x-3}{x+5}\leq0$ $\frac{10-3}{10+5}\leq0$ $\frac{7}{15}\leq0$ (false)
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