Find A2. (Note: A2 = AA.) $A = \left[ \begin{array} { c }
- 5 \
8
\end{array} \right]$
A) $\left[ \begin{array} { l }
25 \
64
\end{array} \right]$
B) $\left[ \begin{array} { l }
- 40 \
- 40
\end{array} \right]$
C) $\left[ \begin{array} { l l }
25 & 64
\end{array} \right]$
D) $\left[ \begin{array} { l l }
- 40 & - 40
\end{array} \right]$
E)not possible

Question

Find A2. (Note: A2 = AA.) $A = \left[ \begin{array} { c } 
- 5 \
8
\end{array} \right]$
A) $\left[ \begin{array} { l } 
25 \
64
\end{array} \right]$
B) $\left[ \begin{array} { l } 
- 40 \
- 40
\end{array} \right]$
C) $\left[ \begin{array} { l l } 
25 & 64
\end{array} \right]$
D) $\left[ \begin{array} { l l } 
- 40 & - 40
\end{array} \right]$
E)not possible

Quizplus · Accepted Answer

Matrix multiplication is defined for two matrices A and B if the number of columns in A is equal to the number of rows in B. Since A is given as a 2x1 matrix (2 rows, 1 column), it cannot be multiplied by itself, making the operation A2 undefined.

Find A2 (Note: A2 = AA A=[−58]A = \left[ \begin{array} { c } - 5 \\8\end{array} \right]A=[−58​]

Find A2 (Note: A2 = AA $A = \left[ \begin{array} { c } - 5 \\8\end{array} \right]$