Answer
$3\times 7$
Work Step by Step
In general, if $A$ is an $m\times p$ matrix and $B$ is a $p\times n$ matrix, then $AB$ is an $m\times n$ matrix. Here, we are given $m=5$, $p=3$, and $n=7$, so $p\times n$ is $3\times 7$.
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 2 - Matrix Algebra - 2.1 Exercises - Page 102: 7
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