Answer
one-to-one, inverse $f^{-1}$.
Work Step by Step
$f(x)=a^x$ is a one-to-one function as it will pass the horizontal line test. A related function can be found as its inverse $f^{-1}$.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 4 - Inverse, Exponential, and Logarithmic Functions - 4.2 Exponential Functions - 4.2 Exercises - Page 435: 127
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