tolong bantu jawab no 18 pake cara

Persamaan matriks berbentuk
AX=B
X=[tex] A^{-1} [/tex] B
X=[tex] \frac{1}{|12+2|} \left[\begin{array}{ccc}3&2&\\-1&4&\\\end{array}\right] \left[\begin{array}{ccc}-14&\\7&\\\end{array}\right] [/tex]
X=[tex] \frac{1}{14} \left[\begin{array}{ccc}(3.-14)+(7.2)&\\(-1.-14)+(4.7)&\\\end{array}\right] [/tex]
X=[tex] \frac{1}{14} \left[\begin{array}{ccc}-42+14&\\14+28&\\\end{array}\right] [/tex]
X=[tex] \frac{1}{14} \left[\begin{array}{ccc}28&\\42&\\\end{array}\right] [/tex]
Disederhanakan menjadi
X=[tex] \left[\begin{array}{ccc}2\\3\\\end{array}\right] [/tex]
Jadi jawaban A