Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 7 - Applications of Trigonometry and Vectors - Section 7.5 - Applications of Vectors - 7.5 Exercises - Page 343: 33

Answer

(a) $ \langle -2,4 \rangle $ (b) $\langle 7 ,4 \rangle $ (c) $\langle 6,-6 \rangle $

Work Step by Step

$ U= \langle -1,2 \rangle $ $ V= \langle 3,0 \rangle $ (a) $ 2U= 2\times\langle -1,2 \rangle $ $ 2U= \langle -2,4 \rangle $ (b) $ 2U+3V=2\times \langle -1,2 \rangle +3\times \langle 3,0 \rangle $ $ 2U+3V= \langle -2,4 \rangle + \langle 9,0 \rangle $ $ 2 U+3V= \langle -2+9,4+0 \rangle $ $ 2 U+3V= \langle 7 ,4 \rangle $ (c) $ V-3U= \langle 3,0 \rangle -3\times \langle -1,2 \rangle $ $ V-3U= \langle 3,0 \rangle - \langle -3,6 \rangle $ $ V-3U= \langle 3+3,0-6 \rangle $ $ V-3U= \langle 6,-6 \rangle $
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