Answer
$\{x|x\le\frac{4}{5}\}$, $3$
Work Step by Step
Step 1. The domain requirement for $f(x)=\sqrt {4-5x}$ is $4-5x\ge0$ or $\{x|x\le\frac{4}{5}\}$
Step 2. $f(-1)=\sqrt {4-5(-1)}=3$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 1 - Functions and Their Graphs - Chapter Test - Page 115: 2
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