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= x^2 + 17x - 18 ( 18nya dari 3 x 6 )
= (x+18per3)(x-1per3) -> per 3 karna tadi di kali 3
= (x+6)(3x-1) -> bisa jadi 3x karna angka 1 itu ga bsa di bagi 3, jadi di kali ke x menjadi 3x
Jadi jawabannya : (3x-1)(x+6)