Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 12 - Exponential Functions and Logarithmic Functions - 12.1 Composite Functions and Inverse Functions - 12.1 Exercise Set - Page 787: 42

Answer

$ a.\quad f$ is one-to-one $b.\quad f^{-1}(x)=3x-6$

Work Step by Step

$ a.\quad$ The function is linear, non-constant. Its graph is an oblique line that passes the horizontal line test (It is impossible to draw a horizontal line that intersects a function's graph more than once.) It is one-to-one and has an inverse. $ b.\quad$ To find a formula for the inverse, 1. Replace $f(x)$ with $y.$ $y=\displaystyle \frac{1}{3}x+2$ 2. Interchange $x$ and $y$. (This gives the inverse function.) $x=\displaystyle \frac{1}{3}y+2$ 3. Solve for $y.$ $x-2=\displaystyle \frac{1}{3}y$ $3(x-2)=y$ $y=3x-6$ 4. Replace $y$ with $f^{-1}(x)$ . (This is inverse function notation.) $f^{-1}(x)=3x-6$
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