Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 7 - Section 7.3 - Simplifying Radicals, the Distance Formula, and Circles - 7.3 Exercises - Page 459: 51


$-2\sqrt 7$

Work Step by Step

$-\sqrt 28=-\sqrt (4\times7)=-\sqrt 4\times\sqrt 7=-2\sqrt 7$ We know that $\sqrt 4=2$, because $2^{2}=4$
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