Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 1 - Functions and Their Graphs - Chapter Review - Review Exercises - Page 113: 3

Answer

(a) $ 2$ (b) $ -2$ (c) $ \frac{-3x}{x^2-1}$ (d) $ -\frac{3x}{x^2-1}$ (e) $ \frac{3(x-2)}{x^2-4x+3}$ (f) $ \frac{6x}{4x^2-1}$

Work Step by Step

Given $f(x)=\frac{3x}{x^2-1}$, we have: (a) $f(2)=\frac{3(2)}{(2)^2-1}=2$ (b) $f(-2)=\frac{3(-2)}{(-2)^2-1}=-2$ (c) $f(-x)=\frac{3(-x)}{(-x)^2-1}=\frac{-3x}{x^2-1}$ (d) $-f(x)=-\frac{3x}{x^2-1}$ (e) $f(x-2)=\frac{3(x-2)}{(x-2)^2-1}=\frac{3(x-2)}{x^2-4x+3}$ (f) $f(2x)=\frac{3(2x)}{(2x)^2-1}=\frac{6x}{4x^2-1}$
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