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x₁² + x₂² = 10
(x₁+x₂)² - 2.x₁.x₂ = 10
(6)² - 2.(k-1) = 10
36 - 2.(k-1) = 10
2.(k-1) = 26
(k-1) = 13
k²-2k+1 = (k-1)²
= 13²
= 169.............opsi E