Answer
$||v||=7\sqrt 2$
Work Step by Step
$v$ goes from $(0,10)$ to $(7,3)$
$v=⟨7-0,3-10⟩=⟨7,-7⟩$
$||v||=\sqrt {v·v}=\sqrt {⟨7,-7⟩·⟨7,-7⟩}=\sqrt {7^2+(-7)^2}=\sqrt {49+49}=\sqrt {49·2}=7\sqrt 2$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 8 - 8.6 - Trigonometric Form of a Complex Number - Review Exercises - Page 616: 39
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