Answer
The minors are:
$M_{11}=4$
$M_{12}=2$
$M_{21}=-3$
$M_{22}=1$
The cofactors of the matrix A are:
$C_{11}=4$
$C_{12}=-2$
$C_{21}=3$
$C_{22}=1$
Work Step by Step
$A=\begin{bmatrix}
1 & -3 \\
2 & 4
\end{bmatrix}$
The minors are:
$M_{11}=4$
$M_{12}=2$
$M_{21}=-3$
$M_{22}=1$
The cofactors of the matrix A are:
$C_{11}=(-1)^{1+1}.4=4$
$C_{12}=(-1)^{1+2}.2=-2$
$C_{21}=(-1)^{2+1}.(-3)=3$
$C_{22}=(-1)^{2+2}.1=1$
