Odpowiedź:
x² - 6x + 5 =0
a = 1 , b = - 6 , c = 5
Δ = b² - 4ac = (- 6)² - 4 * 1 * 5 = 36 - 20 = 16
√Δ = √16 = 4
x₁ = (- b - √Δ)/2a = (6 - 4)/2 = 2/2 = 1
x₂ = ( - b + √Δ)/2a = ( 6 + 4)/2 = 10/2 = 5
