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= - 4
αβ = c/a
= -6
x₁ = 5α
x₂ = 5β
x₁+x₂ = 5α+5β
= 5 (α+β)
= 5 (-4)
= -20
x₁.x₂ = 5α.5β
= 25 (αβ)
= 25. (-6)
= -150
PK : x² - (x₁+x₂) x + x₁.x₂ = 0
x² - (-20)x + (-150) = 0
x² + 20x - 150 = 0