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Dengan komposisi akar:
x₁+x₂ = 1 (Dari -b/a)
x₁x₂ = 0 (Dari c/a)
Maka, jumlah kuadratnya adalah:
x₁²+x₂²
= (x₁+x₂)² - 2x₁x₂
= 1² - 2(0)
= 1 - 0
= 1