Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 9 - Review: 21


$ f^{-1}(x)=x+9$

Work Step by Step

We are given the function, $f(x)=x-9$. First, we must replace $f(x)$ with y. $y=x-9$ Next, interchange x and y. $x=y-9$ Next, solve for y by adding 9 to both sides. $y=x+9$ Finally, replace y with $f^{-1}(x)$. $ f^{-1}(x)=x+9$
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