Answer
$7$
Work Step by Step
$x^{2}=3^{2}+8^{2}-2\times 3\times 8\times \cos 60=9+64-48\times \dfrac {1}{2}=49\Rightarrow x=\sqrt {49}=7$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 8 - Application of Trigonometry - 8.2 The Law of Cosines - 8.2 Exercises - Page 766: 10
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