x² - 6x + c = 0
x₁ = -2
1) x₁ + x₂ = 6
x₂ = 6 - x₁ = 6 - (- 2) = 6 + 2 = 8
x₂ = 8
2) x₁ * x₂ = c
c = - 2 * 8 = - 16
c = - 16
x² - 6x + c = 0
x₁ = -2
1) x₁ + x₂ = 6
x₂ = 6 - x₁ = 6 - (- 2) = 6 + 2 = 8
x₂ = 8
2) x₁ * x₂ = c
c = - 2 * 8 = - 16
c = - 16