Answer
$2\sqrt7$
Work Step by Step
$\sqrt{28}=\sqrt{4\times 7} = \sqrt4 \times \sqrt7 = 2\sqrt7$
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Appendix A - A.4 - Quadratic Equations - Exercises - Page 560: 6a
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