Answer
$u=(a,b,c,d)$ and its additive inverseis is
$$-u=(-a,-b,-c,-d).$$
Work Step by Step
Let $u=(a,b,c,d)$ be a vector in $R^{4}$, then its additive inverse $-u$ is given by
$$-u=(-a,-b,-c,-d).$$
Elementary Linear Algebra 7th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
1-13311-087-8
ISBN 13:
978-1-13311-087-3
Chapter 4 - Vector Spaces - 4.2 Vector Spaces - 4.2 Exercises - Page 160: 7
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