Answer
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Work Step by Step
$(Ax)\cdot y=(Ax)^Ty=x^TA^Ty=x^TAy=x\cdot (Ay)$
Linear Algebra and Its Applications (5th Edition)
by Lay, David C.; Lay, Steven R.; McDonald, Judi J.
Published by
Pearson
ISBN 10:
032198238X
ISBN 13:
978-0-32198-238-4
Chapter 7 - Symmetric Matrices and Quadratic Forms - 7.1 Exercises - Page 402: 27
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