Answer
$ \langle 4,4,0\rangle$
Work Step by Step
$$(u-2v)\times (u+2v)= u\times u+2 u\times v-2v\times u-4v\times v\\ = -4u\times v=4\langle 1,1,0\rangle\\ = \langle 4,4,0\rangle.$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 13 - Vector Geometry - 13.4 The Cross Product - Exercises - Page 677: 21
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