Find A + B. $$A = \left[ \begin{array} { l l }
1 & 2 \
2 & 1
\end{array} \right] , B = \left[ \begin{array} { c c }
- 4 & - 4 \
5 & 4
\end{array} \right]$$
A) $\left[ \begin{array} { c c }
- 3 & - 2 \
7 & 5
\end{array} \right]$
B) $\left[ \begin{array} { c c }
- 1 & 5 \
7 & - 2
\end{array} \right]$
C) $\left[ \begin{array} { c c }
1 & - 2 \
5 & 7
\end{array} \right]$
D) $\left[ \begin{array} { c c }
- 5 & - 2 \
7 & 5
\end{array} \right]$
E) $\left[ \begin{array} { c c }
- 7 & - 2 \
7 & 5
\end{array} \right]$

Question

Find A + B.​ $$A = \left[ \begin{array} { l l } 
1 & 2 \
2 & 1
\end{array} \right] , B = \left[ \begin{array} { c c } 
- 4 & - 4 \
5 & 4
\end{array} \right]$$ ​
A) $\left[ \begin{array} { c c } 
- 3 & - 2 \
7 & 5
\end{array} \right]$
B) $\left[ \begin{array} { c c } 
- 1 & 5 \
7 & - 2
\end{array} \right]$
C) $\left[ \begin{array} { c c } 
1 & - 2 \
5 & 7
\end{array} \right]$
D) $\left[ \begin{array} { c c } 
- 5 & - 2 \
7 & 5
\end{array} \right]$
E) $\left[ \begin{array} { c c } 
- 7 & - 2 \
7 & 5
\end{array} \right]$

Quizplus · Accepted Answer

To find $A + B$, add corresponding elements: $\left[ \begin{array} { l l } 1-4 & 2-4 \ 2+5 & 1+4 \end{array} \right] = \left[ \begin{array} { c c } -3 & -2 \ 7 & 5 \end{array} \right]$.

Find a + B A=[1221],B=[−4−454]A = \left[ \begin{array} { l l } 1 & 2 \\2 & 1\end{array} \right] , B = \left[ \begin{array} { c c } - 4 & - 4 \\5 & 4\end{array} \right]A=[12​21​],B=[−45​−44​]

Find a + B $A = \left[ \begin{array} { l l } 1 & 2 \\2 & 1\end{array} \right] , B = \left[ \begin{array} { c c } - 4 & - 4 \\5 & 4\end{array} \right]$