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g(x) = 1/2 (x-4)²
1/2 (x-4)²>2 I*2
(x-4)² > 4
x²-8x+16-4 >0
x²-8x +12 >0
Δ=64-4*12 = 64-48 =16
√Δ = 4
x₁ = [8-4] / 2 = 4/2=2
x₂ =[8+4] / 2 =12/2=6
parabola ma ramiona skierowane do góry , więc
c∈( -∞;2) U (6;+∞)