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= 1/2
x₁.x₂ = c/a
= 3/4
α = -x₁
β = -x₂
α+β = -x₁+-x₂
= -(x₁+x₂)
= - 1/2
α.β = -x₁.-x₂
= x₁.x₂
= 3/4
PK : x² - (α+β)x + αβ = 0
x² + 1/2 x + 3/4 = 0
4x² + 2x + 3 = 0