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delta =(-(m-2))²-2(m-2)=(2-m)²-2m+4=4-4m+m²-2m+4=m²-6m+8
I rozw :
m²-6m+8=0
36-32=4 √4=2
m₁=2
m₂=4
II rozw.
m²-6m+8>0
m∈(-∞,2)∨(4,+∞)
0 rozw.
m²-6m+8<0
m∈(2,4)