Answer
$\langle 8,-20 \rangle$
Work Step by Step
Step 1: $-4\textbf {u}$
Step 2: $-4\cdot\langle -2,5 \rangle$
Step 3: $\langle -4(-2),-4(5)\rangle$
Step 4: $\langle 8,-20 \rangle$
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 330: 61
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