College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 3 - Polynomial and Rational Functions - Exercise Set 3.6 - Page 422: 99

Answer

False; they have different solution sets.

Work Step by Step

$$\frac{x-2}{x+3} \lt 2$$$$x-2 \lt 2(x+3)$$ $$x-2 \lt 2x + 6$$ $$-2 - 6 \lt 2x - x$$ $$-8 \lt x$$ The exercise assumes that $x-2 \lt 2(x+3)$ is an equivalent inequality; however, it fails to take into account that the original inequality is bound by its denominator which makes it undefined at $x = -3$. Therefore, the solution for $\frac{x-2}{x+3} \lt 2$ is different to that of $x-2 \lt 2(x+3)$ which is to say $(-∞,-3)$U$(-3,∞)$ and $(-8, ∞)$ respectively.
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