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4x² - 9 = x² + 10x + 25 - 9
3x² - 10x - 25 = 0
Δ = -10² - 4 * 3 * (-25) = 100 + 300 = 400
√Δ = √400 = 20
x₁ = -(-10) - 20 / 2 * 3 = 10 - 20 / 6 = -10/6 = -1 2/3
x₂ = -(-10) + 20 / 2 * 3 = 10 + 20 / 6 = 30/6 = 5