Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 7 - Applications of Trigonometry and Vectors - Section 7.4 Vectors, Operations, and the Dot Product - 7.4 Exercises - Page 331: 83

Answer

$-6$

Work Step by Step

Step 1: $3\textbf {u}\cdot\textbf {v}$ Step 2: $3\cdot\langle -2,1 \rangle\cdot\langle 3,4 \rangle$ Step 3: $\langle -6,3\rangle\cdot\langle 3,4\rangle$ Step 4: $-6(3)+3(4)$ Step 5: $-18+12$ Step 6: $-6$
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