College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 8 - Section 8.4 - Matrix Algebra - 8.4 Assess Your Understanding - Page 597: 3

Answer

False.

Work Step by Step

Counterexample: $A=\left[\begin{array}{ll} 1 & 0\\ 1 & 0 \end{array}\right],B=\left[\begin{array}{ll} 0 & 0\\ 1 & 1 \end{array}\right]$ $AB=\left[\begin{array}{ll} 0 & 0\\ 0 & 0 \end{array}\right]$ $BA=\left[\begin{array}{ll} 0 & 0\\ 2 & 0 \end{array}\right]$ Not all corresponding entries of AB and BA are equal, so $AB\neq BA$ The statement is false.
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