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B. 3(2x-1)(2x-1) = (6x-3)(2x-1) = 12x2 - 6x - 6x + 3 = 12x2 - 12x + 3 bisa disederhanakan menjadi 4x2 - - 4x + 1
Catatan : angka 2 dibelakang x adalah kuadrat