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x₁ + x₂ = - 6/2 = - 3
x₁x₂ = c/a = 3/2
Persamaan kuadrat barunya:
x² - (x₁ + x₂ + x₁x₂)x + ((x₁ + x₂)x₁x₂) = 0
x² - (- 3 + 3/2)x + ((-3)(3/2)) = 0
x² - (- 3/2)x - 9/2 = 0
2x² + 3x - 9 = 0