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Δ = 4² - 4 * 1 * 3 = 16 - 12 = 4
√Δ = √4 = 2
x₁ = -4 - 2 / 2 * 1 = -6/2 = -3
x₂ = -4 + 2 / 2 * 1 = -2/2 = -1