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Berlaku untuk:
Hasil kali akar-akarnya adalah c/a, sehingga:
= 2 + 2x - 6x - 6
= 2x (x+1) - 6 (x+1)
= (2x-6) (x+1)
2x - 6 = 0
2x = 6
x = 3
x + 1 = 0
x = -1
Hasil perkaliannya
(3)(-1) = -3