Answer
a. $5i+23j$
b. $-12$
Work Step by Step
a. Given $\vec v=2i+7j$ and $\vec w=i-2j$, we have $3\vec v-\vec w=3(2i+7j)-(i-2j)=5i+23j$
b. We have $\vec v\cdot \vec w=(2i+7j)\cdot(i-2j)=(2)(1)+(7)(-2)=-12$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 6 - Cumulative Review Exercises - Page 801: 17
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