Precalculus (6th Edition)

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



Work Step by Step

$x^{2}=3^{2}+8^{2}-2\times 3\times 8\times \cos 60=9+64-48\times \dfrac {1}{2}=49\Rightarrow x=\sqrt {49}=7$
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