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utk x > 0
x² - 4x + 3 = 0
x₁² + x₂² = (x₁ + x₂)² - 2x₁x₂
= (4)² - 2(3)
= 10
utk x < 0
x² + 4x + 3 = 0
x₁² + x₂² = (x₁ + x₂)² - 2x₁x₂
= (-4)² - 2(3)
= 10