Answer
See answer below
Work Step by Step
Assume $V$ be an inner product space.
Since $u,v,w,x \in V$ we have
$$(u+v,w+x)=(u,w+x)+(v,w+x)\\
=(u,w)+(u,x)+(v,w)+(v,x)$$
Differential Equations and Linear Algebra (4th Edition)
by Goode, Stephen W.; Annin, Scott A.
Published by
Pearson
ISBN 10:
0-32196-467-5
ISBN 13:
978-0-32196-467-0
Chapter 5 - Inner Product Spaces - 5.1 Definition of an Inner Product Space - Problems - Page 351: 31
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