Find the indicated matrix product or state that the product is undefined.
-$$A = \left[ \begin{array} { l }
9 \
9
\end{array} \right] , B = \left[ \begin{array} { r r }
5 & 2 \
- 6 & 3
\end{array} \right]$$
$\mathrm { AB }$
A) Undefined
B)
$$\left[ \begin{array} { r r }
45 & 18 \
- 54 & 27
\end{array} \right]$$
C)
$$\left[ \begin{array} { r }
63 \
- 27
\end{array} \right]$$
D)
$\left[ \begin{array} { l l } - 9 & 45 \end{array} \right]$

Question

Find the indicated matrix product or state that the product is undefined.
-$$A = \left[ \begin{array} { l } 
9 \
9
\end{array} \right] , B = \left[ \begin{array} { r r } 
5 & 2 \
- 6 & 3
\end{array} \right]$$
$\mathrm { AB }$
A) Undefined
B)
$$\left[ \begin{array} { r r } 
45 & 18 \
- 54 & 27
\end{array} \right]$$
C)
$$\left[ \begin{array} { r } 
63 \
- 27
\end{array} \right]$$
D)
$\left[ \begin{array} { l l } - 9 & 45 \end{array} \right]$

Quizplus · Accepted Answer

Matrix multiplication is undefined because the number of columns in matrix A (1) does not match the number of rows in matrix B (2).

Find the Indicated Matrix Product or State That the Product A=[99],B=[52−63]A = \left[ \begin{array} { l } 9 \\9\end{array} \right] , B = \left[ \begin{array} { r r } 5 & 2 \\- 6 & 3\end{array} \right]A=[99​],B=[5−6​23​]

Find the Indicated Matrix Product or State That the Product $A = \left[ \begin{array} { l } 9 \\9\end{array} \right] , B = \left[ \begin{array} { r r } 5 & 2 \\- 6 & 3\end{array} \right]$