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-2=1/2*(m²-1+4m) /*2
m²+4m-1=-4
m²+4m+3=0
Δ=4²-4*3=16-12=4
m=1/2*(-4-2)=-3 lub m=1/2*(-4+2)=-1
Odp. m∈{-3, -1}