Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 7 - Section 7.6 - Vectors: The Dot Product - 7.6 Problem Set - Page 411: 20



Work Step by Step

Since $\textbf {u}=\langle -2,-9 \rangle$ and $\textbf {v}=\langle -3,-1 \rangle$, ${\textbf {u}\cdot\textbf {v}}=-2(-3)+(-9)(-1)=6+9=15$.
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