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Y"-3y-4 = (y-4)(y+1)
= 15 = 3 x 5
8 = 3 + 5
=> jadi (x+3) (x+5) = 0 => x = -3 atau x = -5
2. faktor dari -4 yang jika dijumlahkan hasilnya -3
= -4 = -4 x 1
-3 = -4 + 1
=> (y-4)(y+1) => x = 4 atau x = -1