Cofactor Matrix to Adjoint (2x2) - Full Matrix

Question

Which is the adjoint of this cofactor matrix? The adjoint is the transpose of the cofactor matrix: $	ext{adj}(A) = C^{T}$.

$$\left[ {\begin{array} {cc}  -8 &  -7 \ 9 &  8 \end{array}  } ight]$$

Accepted Answer

$$\left[ {\begin{array} {cc}  -8 &  9 \ -7 &  8 \end{array}  } ight]$$

Answer

$$\left[ {\begin{array} {cc}  -8 &  12 \ -7 &  9 \end{array}  } ight]$$

Answer

$$\left[ {\begin{array} {cc}  -9 &  9 \ -6 &  8 \end{array}  } ight]$$

Answer

$$\left[ {\begin{array} {cc}  -10 &  9 \ -7 &  8 \end{array}  } ight]$$

Practice: Matrices