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a = 1
b = -5
c = 4
Δ = b² - 4ac
Δ = (-5)² - 4*1*4
Δ = 25 - 16
Δ = 9
√Δ = 3
x₁ = -b-√Δ/2a
x₁ = 5 - 3/2*1 = 2/2 = 1
x₁ = 1
x₂ = -b + √Δ/2a
x₂ = 5 + 3/2 = 8/2
x₂ = 4
x∈ <1 , 4 >