Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 1 - Graphs - 2.1 Functions - 2.1 Assess Your Understanding - Page 58: 73

Answer

a. $1+\frac{2}{x}$ b. $1$ c. $1+x$ d. $x+1$ e. $1\frac{2}{3}$ f. $1$ g. $3$ h. $2$

Work Step by Step

$f(x) = 1 + \frac{1}{x}$ $g(x)=\frac{1}{x}$ a. $(f+g)(x)$ $=1 + \frac{1}{x} + \frac{1}{x}$ $=1+\frac{2}{x}$ b. $(f-g)(x)$ $=1 + \frac{1}{x} -\frac{1}{x}$ $=1$ c. $(f \cdot g)(x)$ $=1 + \frac{1}{\frac{1}{x}}$ $=1+x$ d. $(\frac{f}{g})(x)$ $=\frac{1+\frac{1}{x}}{\frac{1}{x}}$ $=x+1$ e. $(f+g)(3)$ $=1 + \frac{1}{x} + \frac{1}{x}$ $=1+\frac{2}{x}$ $=1+\frac{2}{3}$ $=1\frac{2}{3}$ f. $(f-g)(4)$ $=1 + \frac{1}{x} -\frac{1}{x}$ $=1$ g. $(f \cdot g)(2)$ $=1 + \frac{1}{\frac{1}{x}}$ $=1+x$ $=1+2$ $=3$ h. $(\frac{f}{g})(1)$ $=\frac{1+\frac{1}{x}}{\frac{1}{x}}$ $=x+1$ $=1+1$ $=2$
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