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x²-x-6=0 v 3x-12=0
3x=12
x=4
Δ=1+4*6=25
x=1/2*(1-5)=-2 v x=1/2*(1+5)=3
Odp. x∈{-2, 3, 4}
2.
x³(x+27)=0
x=0 v x+27=0
x=0 v x=-27