Answer
$AB$ is defined and it is $2\times2$.
Work Step by Step
We can get the $2\times2$ dimensions by looking at the number of rows that matrix $A$ has and the number of columns that matrix $B$ has.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 3 Linear Systems and Matrices - 3.6 Multiplying Matrices - 3.6 Exercises - Skill Practice - Page 199: 3
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