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a = - 1
b = - 1
c = 2
Δ = b² - 4ac = (- 1)² - 4 * ( - 1) * 2 = 1 + 9 = 9
√Δ = √9 = 3
m₁ = ( - b - √Δ)/2a = (1 - 3)/ - 2 = - 2/- 2 = 1
m₂ = ( - b + √Δ)/2a =(1 + 3)/ - 2 = - 4/2 = - 2
m = 1 lub m = - 2