Perform the Indicated Operation $\mathrm { A } = \left[ \begin{array} { r r r } - 8 & 2 & 5 \\ 6 & - 1 & 1 \\ - 4 & 2 & 7 \end{array} \right]$

Perform the indicated operation.
-Let $\mathrm { A } = \left[ \begin{array} { r r r } - 8 & 2 & 5 \\ 6 & - 1 & 1 \\ - 4 & 2 & 7 \end{array} \right]$ and $\mathrm { B } = \left[ \begin{array} { r r r } 1 & - 8 & 4 \\ 5 & 3 & 2 \\ - 9 & 1 & 2 \end{array} \right]$ . Find $\mathrm { A } - \mathrm { B }$ .

A) $\left[ \begin{array} { r r r } - 9 & 10 & 1 \\ 1 & - 4 & - 1 \\ 5 & 1 & 5 \end{array} \right]$

B) $\left[ \begin{array} { r r r } 10 & - 9 & 1 \\ 1 & - 4 & - 1 \\ 5 & 1 & 5 \end{array} \right]$

C) $\left[ \begin{array} { r r r } - 9 & 10 & 1 \\ 1 & - 4 & - 1 \\ 5 & 5 & 1 \end{array} \right]$

D) $\left[ \begin{array} { r r r } - 9 & 10 & 1 \\ 1 & - 4 & - 1 \\ - 13 & 1 & 5 \end{array} \right]$

Correct Answer:

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