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+_ --> artinya plus minus
2. D1,2 = (-b +_ √b²-4ac) / 2a
D1,2 = (-2+_ √4-(4x1x-15))/2x1
D1,2 = -1 +_ 4
Jadi D 1= -1 + 4 = 3 ; D 2 = -1 -4 = -5
2.×2-2×=15
×=15
maaf kalok salah