[tex]\huge \bf༆ Answer ༄[/tex]
Here's the solution ~
[tex]{ \qquad{ \sf{ \dashrightarrow}}} \: \: \sf \:a_{11} × a_{22} - a_{21} × a_{12}[/tex]
[tex]{ \qquad{ \sf{ \dashrightarrow}}} \: \: \sf \:(2 \times 4) - ( - 1 \times - 3)[/tex]
[tex]{ \qquad{ \sf{ \dashrightarrow}}} \: \: \sf \:8 - 3[/tex]
[tex]{ \qquad{ \sf{ \dashrightarrow}}} \: \: \sf \:5[/tex]
