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2010-02-10T09:02:03+01:00
X²-5x+4>0
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 >
1 5 1