Find the Inverse of the Matrix $$\left[ \begin{array} { c c } 3 & 6 \\- 9 & - 15\end{array} \right]$$

question 21

Multiple Choice

Find the inverse of the matrix $$\left[ \begin{array} { c c } 3 & 6 \\- 9 & - 15\end{array} \right]$$ .

• A)​ \[\frac { 1 } { 7 } \left[ \begin{array} { c c }
• 3 & 6 \\
• - 9 & - 15
• \end{array} \right]\]
• B)​ \[\frac { 1 } { 3 } \left[ \begin{array} { c c }
• - 5 & - 2 \\
• 3 & 1
• \end{array} \right]\]
• C)​ \[\left[ \begin{array} { c c }
• - 3 & - 6 \\
• 15 & 9
• \end{array} \right]\]
• D)​ \[\left[ \begin{array} { c c }
• 3 & - 9 \\
• 12 & - 21
• \end{array} \right]\]
• E)​ \[\frac { 1 } { 13 } \left[ \begin{array} { l l }
• - 3 & - 6 \\
• - 9 & 15
• \end{array} \right]\]

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