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2x² - x² - 4x + 6x + 4 - 9 = 0
x² + 2x - 5 = 0
a = 1
b = 2
c = - 5
Δ = b² - 4ac = 4 - 4 * 1 * - 5 = 4 + 20 = 24
√Δ = √24 = 2√6
x₁ = (- b - √Δ)/2a = (- 2 - 2√6)/2 = -2(1 + √6)/2 = - (1 + √6)
x₂ = (- b + √Δ)/2a = ( - 2 + 2√6)/2 = 2(√6 - 1)/2 = √6 - 1