Answer
$a•b=-2000\sqrt 2$
Work Step by Step
$a•b=|a||b|cos\theta$
$=(80)(50)cos(\frac{3\pi}{4})$
$=-2000\sqrt 2$
Calculus: Early Transcendentals 8th Edition
by Stewart, James
Published by
Cengage Learning
ISBN 10:
1285741552
ISBN 13:
978-1-28574-155-0
Chapter 12 - Section 12.3 - The Dot Product - 12.3 Exercises - Page 812: 10
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