Answer
$-5 \vec{i}-\vec{j}$
Work Step by Step
We simplify:
$(\vec{i}+ 2\vec{j})+(-3)(2\vec{i}+\vec{j})=i+2j -6i -3j \\ =i-6i+2j-3j\\=-5 \vec{i}-\vec{j}$
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 12 - Vectors and Matrices - Review Exercises and Problems for Chapter Twelve - Page 532: 12
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