Rozwiąż nierówność x²-4x-5≥0
Δ = b^2 - 4ac ⇒ Δ = 16+4*5 ⇒ Δ = 36x1 = (4 - 6)/2 = -1x2 = (4+6)/2 = 5a>0 > parabola rosnie
wiec
x ∈ (-∞,-1> U <5,∞)
x²-4x-5≥0
Δ=b²-4ac=4²-4*1*(-5)=16+20=36
√Δ=6
x₁=[-b-√Δ]/2a=[4-6]/2=-2/2=-1
x₂=[-b+√Δ]/2a=[4+6]/2=10/2=5
x∈(-∞, -1>u<5, ∞)
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Δ = b^2 - 4ac ⇒ Δ = 16+4*5 ⇒ Δ = 36
x1 = (4 - 6)/2 = -1
x2 = (4+6)/2 = 5
a>0 > parabola rosnie
wiec
x ∈ (-∞,-1> U <5,∞)
x²-4x-5≥0
Δ=b²-4ac=4²-4*1*(-5)=16+20=36
√Δ=6
x₁=[-b-√Δ]/2a=[4-6]/2=-2/2=-1
x₂=[-b+√Δ]/2a=[4+6]/2=10/2=5
x∈(-∞, -1>u<5, ∞)