Answer
domain: $(9,+\infty)$
Work Step by Step
$f(x)=\frac{4}{\sqrt {x-9}}$
$x-9\gt0$
$x\gt9$
Therefore, the domain of a function is $x\gt9$ or $(9,+\infty)$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 2 - Functions and Their Graphs - 2.1 Functions - 2.1 Assess Your Understanding - Page 57: 62
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