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= -6/2
= -3
x₁.x₂ = c/a
= 3/2
jika α = x₁+x₂ = -3
β = x₁.x₂ = 3/2
α+β = -3+3/2
= - 3/2
α.β = -3.3/2
= -9/2
Pk : x² - (α+β) x + αβ = 0
x² + 3/2 x - 9/2 = 0
----------------------------- x 2
2x² + 3x - 9 = 0