Answer
$[20,\infty)$
Work Step by Step
The radicand of the given function, $
f(x)=5\sqrt{x-20}+1
$ is a non-negative number. Hence,
\begin{array}{l}\require{cancel}
x-20\ge0
\\\\
x\ge20
.\end{array}
The domain is $
[20,\infty)
.$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 3 - Section 3.6 - Graphing Piecewise-Defined Functions and Shifting and reflecting Graphs of Functions - Exercise Set - Page 183: 61
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