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a=3 b=4 c= -4
Δ = b^2 - 4ac
Δ =16-4*3*(-4)
Δ =16+48
Δ =64 √Δ=8
x1=-b-√Δ/2a=-4-8 /6= -2
x2=-b+√Δ /2a= -4+8/6= 2/3
x należy (-∞,-2)U(2/3, +∞)