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det A = 0
x . x - 4 . 9 = 0
x² - 36 = 0
x² = 36
x = √36
x = 6 atau x = - 6 ... jawaban : D
det (C) = ( - 6 . - 1) - ( - 6 . 0)
= 6 - 0
= 6 .... jawaban : B