Answer
$(4,-2, 18)$
Work Step by Step
$(\vec{a}+\vec{b})-(\vec{a}-\vec{b})=\vec{a}+\vec{b}-\vec{a}+\vec{b}\\=2 \vec{b}\\= 2 (2,-1, 9) \\=(4,-2, 18)$
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 531: 7
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