Answer
See answers below
Work Step by Step
$\begin{bmatrix}
2 & -4\\
-4 & 8
\end{bmatrix} \approx^1 \begin{bmatrix}
1 & -2 \\
-4 & 8
\end{bmatrix} \approx^2 \begin{bmatrix}
1 & -2\\
0 & 0
\end{bmatrix}$
Rank (A) =1
The rank of each matrix:
$M_1(\frac{1}{2})$
$A_{12}(4)$
