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Mengingat teorema Vieta:
x₁+x₂+x₃ = -6/2 = -3
x₁x₂+x₁x₃+x₂x₃ = 5/2
Maka:
x₁²+x₂²+x₃²
= (x₁+x₂+x₃)² - 2(x₁x₂+x₁x₃+x₂x₃)
= (-3)² - 2(5/2)
= 9 - 5
= 4