Find A + B.
-$A = \left[ \begin{array} { r r r }
- 6 & - 9 & - 5 \
2 & - 1 & - 2
\end{array} \right] , B = \left[ \begin{array} { r r }
- 9 & - 6 \
- 5 & - 3 \
- 5 & 6
\end{array} \right]$
A) $\left[ \begin{array} { r r } - 12 & - 7 \ - 12 & - 6 \ 1 & - 7 \end{array} \right]$
B) $\left[ \begin{array} { r r } - 15 & - 15 \ - 3 & - 4 \end{array} \right]$
C) $\left[ \begin{array} { r r r } - 15 & - 15 & - 5 \ - 3 & - 4 & - 2 \end{array} \right]$
D) Undefined

Question

Find A + B.
-$A = \left[ \begin{array} { r r r } 
- 6 & - 9 & - 5 \
2 & - 1 & - 2
\end{array} \right] , B = \left[ \begin{array} { r r } 
- 9 & - 6 \
- 5 & - 3 \
- 5 & 6
\end{array} \right]$
A) $\left[ \begin{array} { r r } - 12 & - 7 \ - 12 & - 6 \ 1 & - 7 \end{array} \right]$
B) $\left[ \begin{array} { r r } - 15 & - 15 \ - 3 & - 4 \end{array} \right]$
C) $\left[ \begin{array} { r r r } - 15 & - 15 & - 5 \ - 3 & - 4 & - 2 \end{array} \right]$
D) Undefined

Quizplus · Accepted Answer

Matrix addition is only defined for matrices of the same dimensions. Matrix A is 2x3 and Matrix B is 3x2, so their sum is undefined.

Find a + B A) [−12−7−12−61−7]\left[ \begin{array} { r r } - 12 & - 7 \\ - 12 & - 6 \\ 1 & - 7 \end{array} \right]​−12−121​−7−6−7​​

Find a + B A) $\left[ \begin{array} { r r } - 12 & - 7 \\ - 12 & - 6 \\ 1 & - 7 \end{array} \right]$