Answer
$-2\sqrt 7$
Work Step by Step
$-\sqrt 28=-\sqrt (4\times7)=-\sqrt 4\times\sqrt 7=-2\sqrt 7$
We know that $\sqrt 4=2$, because $2^{2}=4$
Intermediate Algebra (12th Edition)
by Lial, Margaret L.; Hornsby, John; McGinnis, Terry
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
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