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Karena untuk u = 2 menyebabkan:
0 = 2² - 3(2) + 2
0 = 4 - 6 + 2
0 = 0
(Terpenuhi)
Maka:
u² - 3u + 2 = (u-2)(u-1)
Sehingga:
x₁ = 1
x₂ = 2
Menyebabkan:
x₁+x₂ = 1 + 2
x₁+x₂ = 3