Answer
$A+B$ is defined and will yield $3\times 4$ matrix.
Work Step by Step
$A+B$ is defined and will yield $3\times 4$ matrix.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.