Answer
$5$
Work Step by Step
From the law of cosines
$x^{2}=1^{2}+\left( 4\sqrt {2}\right) ^{2}-2\times 1\times \left( 4\sqrt {2}\right) \times \cos 45=1+32-8=25\Rightarrow x=\sqrt {25}=5$
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: 9
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