Answer
$-6$
Work Step by Step
Step 1: $\textbf {u}\cdot3\textbf {v}$
Step 2: $\langle -2,1 \rangle\cdot(3\cdot\langle 3,4 \rangle)$
Step 3: $\langle -2,1 \rangle\cdot\langle 9,12 \rangle$
Step 4: $-2(9)+1(12)$
Step 5: $-18+12$
Step 6: $-6$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
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: 84
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