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Δ=4²-4*8 = 16-32 =-16 < 0 i a>0
D=R
f'(x)=(2x-4)/[(x²-4x+8)ln2]
2x-4=0
x=2
min= f(2) = log₂(4-8+8)=log₂4 = 2
ZW=<2, +∞)