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Mengenal:
Maka,
Sehingga,
c = 8
x₁² - x₂² = -12
(x₁ + x₂) (x₁ - x₂) = -12
(-6) (x₁ - x₂) = -12
(x₁ - x₂) = 2
x₁ - x₂ = √D / a
2 = √(b² - 4ac)
4 = b² - 4ac
4 = 6² - 4(1)(C)
4 = 36 - 4C
4C = 32
C = 8
Jadi, nilai dari C adalah 8
Ok?