Find the Indicated Matrix $\mathrm { A } = \left[ \begin{array} { r r } 2 & - 1 \\ 7 & 9 \end{array} \right]$

question 28

Multiple Choice

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

• A) \(\left[ \begin{array} { l r } 7 & 4 \\ 11 & 13 \end{array} \right]\)
• B) \(\left[ \begin{array} { l l } - 24 & - 18 \\ - 30 & - 34 \end{array} \right]\)
• C) \(\left[ \begin{array} { r r } 16 & - 10 \\ 2 & 10 \end{array} \right]\)
• D) \(\left[ \begin{array} { r r } - 3 & - 6 \\ 3 & 5 \end{array} \right]\)

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