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Ternyata diperoleh A+B= [-1 -1]
[-1 2]
Selanjutnya akan menjadi:
X [-1 -1] =[-1 -1]
[-1 2] [-7 5]
X=[-1 -1] . 1/-3. [2 1]
[-7 5] [1 -1]
X=[1 2/3]
[3 4]
Maka det.X = 1.4-(2/3.3)
=4-2
=2
Jadi, det X adalah 2