Use the Inverse Formula $A ^ { - 1 } = \frac { 1 } { a d - b c } \left[ \begin{array} { c c } d & - b \\- c & a\end{array} \right]$

Multiple Choice

Use the inverse formula $A ^ { - 1 } = \frac { 1 } { a d - b c } \left[ \begin{array} { c c } d & - b \\- c & a\end{array} \right]$ to find the inverse of the matrix (if it exists) .
$\left[ \begin{array} { c c } - 7 & - 9 \\7 & 9\end{array} \right]$

A) $\left[ \begin{array} { c c } - 9 & - 9 \\7 & 7\end{array} \right]$
B) $\left[ \begin{array} { r r } - 9 & - 9 \\- 7 & - 7\end{array} \right]$
C) $\left[ \begin{array} { c c } - 9 & 9 \\7 & - 7\end{array} \right]$
D) $\left[ \begin{array} { c c } 9 & - 9 \\7 & 7\end{array} \right]$
E) Does not exist