Answer
$\frac{x-1}{x}$, $x\ne0,1$
Work Step by Step
$f(x)=\frac{1}{1-x}$
Hence, f(f(x))=$\frac{1}{1-(\frac{1}{1-x})}=\frac{x-1}{x}$,
x cannot be zero or 1 (domain calculation).
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 2 - P.S. Problem Solving - Page 240: 12b
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