за теоремой Виэта x1+x2=-12
x1*x2=6
(x₁ + x₂)² = x₁² + x₂² + 2x₁·x₂
x₁² + x₂² = (x₁ + x₂)² - 2x₁·x₂ = (-12)² - 2 · 6 = 144 - 12 = 132
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за теоремой Виэта x1+x2=-12
x1*x2=6
(x₁ + x₂)² = x₁² + x₂² + 2x₁·x₂
x₁² + x₂² = (x₁ + x₂)² - 2x₁·x₂ = (-12)² - 2 · 6 = 144 - 12 = 132