x²-3x+2 ≤ 0
a = 1, b = -3, c = 2
Δ = b²-4ac = 9-8 = 1
√Δ = 1
x1 = (-b-√Δ)/2a = (3-1)/2 = 1
x2 = (-b+√Δ)/2a = (3+1)/2 = 2
a = 1 > 0, ramiona paraboli skierowane w górę
x ∈ <1; 2>
x²+11x+30 ≤ 0
a = 1, b = 11, c = 30
Δ = b²-4ac = 121-120 = 1
x1 = (-b-√Δ)/a = (-11-1)/2 = -6
x2 = (b+√Δ)/2a = (-11+1)/2 = -5
x ∈ <-6; -5)
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x²-3x+2 ≤ 0
a = 1, b = -3, c = 2
Δ = b²-4ac = 9-8 = 1
√Δ = 1
x1 = (-b-√Δ)/2a = (3-1)/2 = 1
x2 = (-b+√Δ)/2a = (3+1)/2 = 2
a = 1 > 0, ramiona paraboli skierowane w górę
x ∈ <1; 2>
x²+11x+30 ≤ 0
a = 1, b = 11, c = 30
Δ = b²-4ac = 121-120 = 1
√Δ = 1
x1 = (-b-√Δ)/a = (-11-1)/2 = -6
x2 = (b+√Δ)/2a = (-11+1)/2 = -5
a = 1 > 0, ramiona paraboli skierowane w górę
x ∈ <-6; -5)