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M11 = 9 x 8 - 3 x 4 = 72 - 12 = 60
M12 = -1 x 8 - 9 x 3 = -8 - 27 = -35
M31 = -1 x 4 - 9 x 9 = -4 - 81 = -85
M12 = 4 x 8 - 4 x 1 = 32 - 4 = 28
M22 = 7 x 8 - 9 x 1 = 56 - 9 = 47
M32 = 7 x 4 - 9 x 4 = 28 - 36 = -8
semoga dapat membantu