If $A$ is a $3 \times 4$ matrix and the matrix sum $A+B$ exists, what can you say about the matrix $B$ ?
A) B is a matrix with 3 rows
B) B is a $3 \times 4$ matrix
C) B is a matrix with 4 rows
D) B is a matrix with 4 columns

Question

Quizplus · Accepted Answer

For the matrix sum $A + B$ to exist, matrices $A$ and $B$ must have the same dimensions. Since $A$ is a $3 \times 4$ matrix, $B$ must also be a $3 \times 4$ matrix.

If AAA Is A 3×43 \times 43×4 Matrix and the Matrix Sum A+BA+BA+B

If $A$ Is A $3 \times 4$ Matrix and the Matrix Sum $A+B$