Find the indicated sum or difference, if it is defined.
-$$\left[ \begin{array} { r r }
- 1 & 5 \
0 & 4 \
8 & - 4
\end{array} \right] - \left[ \begin{array} { l l }
2 & 1 \
7 & 4 \
4 & 2
\end{array} \right]$$
A) $\left[ \begin{array} { r r } - 3 & 4 \ - 7 & 0 \ 4 & - 6 \end{array} \right]$
B) $\left[ \begin{array} { r r } 3 & - 4 \ 7 & 0 \ - 4 & 6 \end{array} \right]$
C) not defined
D) $\left[ \begin{array} { r r } 1 & 6 \ 7 & 8 \ 12 & - 2 \end{array} \right]$

Question

Find the indicated sum or difference, if it is defined.
-$$\left[ \begin{array} { r r } 
- 1 & 5 \
0 & 4 \
8 & - 4
\end{array} \right] - \left[ \begin{array} { l l } 
2 & 1 \
7 & 4 \
4 & 2
\end{array} \right]$$
A) $\left[ \begin{array} { r r } - 3 & 4 \ - 7 & 0 \ 4 & - 6 \end{array} \right]$
B) $\left[ \begin{array} { r r } 3 & - 4 \ 7 & 0 \ - 4 & 6 \end{array} \right]$
C) not defined
D) $\left[ \begin{array} { r r } 1 & 6 \ 7 & 8 \ 12 & - 2 \end{array} \right]$

Quizplus · Accepted Answer

To find the difference between two matrices, subtract corresponding elements. For the given matrices, the subtraction results in: $$ \left[ \begin{array} { r r } -1-2 & 5-1 \ 0-7 & 4-4 \ 8-4 & -4-2 \end{array} \right] = \left[ \begin{array} { r r } -3 & 4 \ -7 & 0 \ 4 & -6 \end{array} \right] $$

Find the Indicated Sum or Difference, If It Is Defined