Answer
$2u·u=40$
Work Step by Step
$2u·u=2⟨-4,2⟩⋅⟨-4,2⟩=⟨2(-4),2(2)⟩⋅⟨-4,2⟩=⟨-8,4⟩⋅⟨-4,2⟩=-8(-4)+4(2)=32+8=40$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 8 - Review Exercises - Page 617: 73
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