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 415: 100

Answer

The provided statement is false and the correct statement is “The inequalities $\left( x+3 \right)\left( x-1 \right)\ge 0$ and $\frac{x+3}{x-1}\ge 0$ have different solution sets.

Work Step by Step

First consider the inequality $\left( x+3 \right)\left( x-1 \right)\ge 0$. Solve this to get, $x\le -3$ and $x\ge 1$ Hence, the solution set of $\left( x+3 \right)\left( x-1 \right)\ge 0$ is $\left( -\infty ,-3 \right]\cup \left[ 1,\infty \right)$. Now, consider the inequality $\frac{x+3}{x-1}\ge 0$. Divide both sides by ${{\left( x-1 \right)}^{2}},x\ne 1$. ${{\left( x-1 \right)}^{2}}\frac{x+3}{x-1}\ge 0$ $x\le -3$ And $x>1$ Hence, the solution set of $\frac{x+3}{x-1}\ge 0$ is $\left( -\infty ,-3 \right]\cup \left( 1,\infty \right)$. Hence, the provided statement is false. The provided statement is false and the correct statement is “The inequalities $\left( x+3 \right)\left( x-1 \right)\ge 0$ and $\frac{x+3}{x-1}\ge 0$ have different solution sets”.
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