Arrange the entries of matrix [tex]A[/tex] in increasing order of their cofactor values.

[tex]\[
A = \begin{bmatrix}
7 & 5 & 3 \\
-7 & 4 & -1 \\
-8 & 2 & 1
\end{bmatrix}
\][/tex]

\begin{tabular}{|c|c|}
\hline
\text{Cofactor} & \text{Order} \\
\hline
[tex]$C_{11}$[/tex] & \\
\hline
[tex]$C_{12}$[/tex] & [tex]$\downarrow$[/tex] \\
\hline
[tex]$C_{21}$[/tex] & \\
\hline
[tex]$C_{23}$[/tex] & [tex]$\downarrow$[/tex] \\
\hline
[tex]$C_{31}$[/tex] & [tex]$\downarrow$[/tex] \\
\hline
[tex]$C_{33}$[/tex] & \\
\hline
& [tex]$\downarrow$[/tex] \\
\hline
\end{tabular}



Answer :

To arrange the entries of matrix [tex]\( A \)[/tex] in increasing order of their cofactor values, we need to first determine the cofactor for each entry in the matrix. Here, we already have the cofactor values calculated for each element:

- [tex]\( A_{11} \)[/tex] has a cofactor of [tex]\(6\)[/tex]
- [tex]\( A_{12} \)[/tex] has a cofactor of [tex]\(15\)[/tex]
- [tex]\( A_{13} \)[/tex] has a cofactor of [tex]\(18\)[/tex]
- [tex]\( A_{21} \)[/tex] has a cofactor of [tex]\(1\)[/tex]
- [tex]\( A_{22} \)[/tex] has a cofactor of [tex]\(31\)[/tex]
- [tex]\( A_{23} \)[/tex] has a cofactor of [tex]\(-54\)[/tex]
- [tex]\( A_{31} \)[/tex] has a cofactor of [tex]\(-17\)[/tex]
- [tex]\( A_{32} \)[/tex] has a cofactor of [tex]\(-14\)[/tex]
- [tex]\( A_{33} \)[/tex] has a cofactor of [tex]\(63\)[/tex]

Next, we list these cofactor values in increasing order:
[tex]\[ -54, -17, -14, 1, 6, 15, 18, 31, 63 \][/tex]

Now, we map each cofactor back to its corresponding matrix entry:

- Cofactor [tex]\(-54\)[/tex] corresponds to [tex]\( A_{23} \)[/tex]
- Cofactor [tex]\(-17\)[/tex] corresponds to [tex]\( A_{31} \)[/tex]
- Cofactor [tex]\(-14\)[/tex] corresponds to [tex]\( A_{32} \)[/tex]
- Cofactor [tex]\( 1 \)[/tex] corresponds to [tex]\( A_{21} \)[/tex]
- Cofactor [tex]\( 6 \)[/tex] corresponds to [tex]\( A_{11} \)[/tex]
- Cofactor [tex]\( 15 \)[/tex] corresponds to [tex]\( A_{12} \)[/tex]
- Cofactor [tex]\( 18 \)[/tex] corresponds to [tex]\( A_{13} \)[/tex]
- Cofactor [tex]\( 31 \)[/tex] corresponds to [tex]\( A_{22} \)[/tex]
- Cofactor [tex]\( 63 \)[/tex] corresponds to [tex]\( A_{33} \)[/tex]

Summarizing, the entries of matrix [tex]\( A \)[/tex] arranged in increasing order of their cofactor values would be:

[tex]\[ \begin{tabular}{|c|c|} \hline Position & Cofactor \\ \hline \( A_{23} \) & \(-54\) \\ \( A_{31} \) & \(-17\) \\ \( A_{32} \) & \(-14\) \\ \( A_{21} \) & \( 1 \) \\ \( A_{11} \) & \( 6 \) \\ \( A_{12} \) & \( 15 \) \\ \( A_{13} \) & \( 18 \) \\ \( A_{22} \) & \( 31 \) \\ \( A_{33} \) & \( 63 \) \\ \hline \end{tabular} \][/tex]