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a= 3, b = -10, c = 3
x₁ + x₂ = -b/a = 10/3
x₁ x₂ = c/a = 3/3 = 1
(x₁ + x₂)² = (x₁² + x₂²) + 2 x₁ x₂
(x₁² + x₂²)= (x₁ + x₂)² - 2 (x₁ x₂ ) = (10/3)² - 2(1) = 100/9 - 2= 9 ¹/₉