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delta=2^2-4*V3*(-V3)=4+12=16
pierw. z delta =4
x1=[-2-4]/[2V3]=[-6]/[2V3]=-3/V3=-V3
x2=[-2+4]/[2V3]=[2]/[2V3]=1/V3=V3/3
x€ <-V3, V3/3>
b)
-5>=x^2-4x+4
x^2-4x+9<=0
delta=(-4)^2-4*1*9=-20
x€ zbiór pusty
c)
(x+3)^2>0
x+3=0
x=-3
x€ R\{-3}