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4(2,5 - 2x - 1,25x + x²) = x²
10 - 8x - 5x + 4x² = x²
4x² - x² - 13x + 10 = 0
3x² - 13x + 10 = 0
Δ = (- 13)² - 4 * 3 * 10 = 169 - 120 = 49
√Δ = √49 = 7
x₁ = (- b - √Δ)/2a =( 13 - 7)/6 = 6/6 = 1
x₂ = ( - b + √Δ)/2a = (13 + 7)/6 = 20/6 = 10/3 = 3 1/3