Answer
$\sqrt {-x}$
Work Step by Step
Step 1. A reflection about the y-axis means that $f(x)$ becomes $f(-x)$.
Step 2. For $y=\sqrt x$, the above reflection gives $y=\sqrt {-x}$ where $x\le0$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 3 - Linear and Quadratic Functions - 3.3 Quadratic Functions and Their Properties - 3.3 Assess Your Understanding - Page 148: 104
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