Answer
$$(v-w)\cdot v+v\cdot w= \|v\|^2.$$
Work Step by Step
Using the properties of the dot product, we have
$$(v-w)\cdot v+v\cdot w=v\cdot v -w\cdot v+v\cdot w\\
=v\cdot v -v\cdot w+v\cdot w=v\cdot v=\|v\|^2.$$
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 - 13.3 Dot Product and the Angle Between Two Vectors - Exercises - Page 666: 35
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