Perform the operation or operations when possible.
-$$\left[ \begin{array} { r r }
- 5 & - 4 \
7 & 4
\end{array} \right] + \left[ \begin{array} { r r }
- 9 & 3 \
1 & 2
\end{array} \right] - \left[ \begin{array} { r r }
7 & - 2 \
- 2 & 8
\end{array} \right]$$
A)
$\left[\begin{array}{rr}
-7 & -3 \
6 & 14
\end{array}\right]$
B)
$\left[\begin{array}{rr}
-3 & -5 \
8 & -6
\end{array}\right]$
C)
$\left[\begin{array}{rr}
11 & -9 \
4 & 10
\end{array}\right]$
D)
$\left[\begin{array}{rr}
-21 & 1 \
10 & -2
\end{array}\right]$

Question

Perform the operation or operations when possible.
-$$\left[ \begin{array} { r r } 
- 5 & - 4 \
7 & 4
\end{array} \right] + \left[ \begin{array} { r r } 
- 9 & 3 \
1 & 2
\end{array} \right] - \left[ \begin{array} { r r } 
7 & - 2 \
- 2 & 8
\end{array} \right]$$
A)
$\left[\begin{array}{rr}
-7 & -3 \
6 & 14
\end{array}\right]$
B)
$\left[\begin{array}{rr}
-3 & -5 \
8 & -6
\end{array}\right]$
C)
$\left[\begin{array}{rr}
11 & -9 \
4 & 10
\end{array}\right]$
D)
$\left[\begin{array}{rr}
-21 & 1 \
10 & -2
\end{array}\right]$

Quizplus · Accepted Answer

To perform the operations, add the first two matrices and then subtract the third matrix:  $\left[ \begin{array} { r r } - 5 & - 4 \ 7 & 4 \end{array} \right] + \left[ \begin{array} { r r } - 9 & 3 \ 1 & 2 \end{array} \right] = \left[ \begin{array} { r r } -14 & -1 \ 8 & 6 \end{array} \right]$  Then subtract the third matrix:  $\left[ \begin{array} { r r } -14 & -1 \ 8 & 6 \end{array} \right] - \left[ \begin{array} { r r } 7 & -2 \ -2 & 8 \end{array} \right] = \left[ \begin{array} { r r } -21 & 1 \ 10 & -2 \end{array} \right]$  Thus, the correct answer is D.

Perform the Operation or Operations When Possible A) [−7−3614]\left[\begin{array}{rr}-7 & -3 \\6 & 14\end{array}\right][−76​−314​]

Perform the Operation or Operations When Possible A) $\left[\begin{array}{rr}-7 & -3 \\6 & 14\end{array}\right]$