... #JawabPakaiCara# ...

Jawabannya 18,semoga bisa membantu ya :)

C = [tex] \left[\begin{array}{ccc}-4&2\\-3&1\\\end{array}\right] [/tex]
3C = 3  [tex] \left[\begin{array}{ccc}-4&2\\-3&1\\\end{array}\right] [/tex]
3C =  [tex] \left[\begin{array}{ccc}-12&6\\-9&3\\\end{array}\right] [/tex]

Determinan 3C =  [tex] \left[\begin{array}{ccc}-12&6\\-9&3\\\end{array}\right] [/tex]
Determinan 3C = (-12 x 3) - (-9 x 6)
Determinan 3C = - 36 - (-54)
Determinan 3C = -36 + 54 
Determinan 3C = 18