Finally, we add these numbers together, as given in the following equation. \[\det \left(A\right) = 1 \overset{C_{11}}{\overbrace{\left( -1\right) ^{1+1}\left| \begin{array}{rr} 3 & 2 \\ 2 & 1 \end{ar...Finally, we add these numbers together, as given in the following equation. det(A)=1C11⏞(−1)1+1|3221|+4C21⏞(−1)2+1|2321|+3C31⏞(−1)3+1|2332| Calculating each of these, we obtain \[…