-х^2-2х+3>=0 4х^2+4х+1>0
1)х²+2х-3≤0 х1+х2=-2 и х1*х2=-3⇒х1=-3 и х2=1 + _ + ------------------------------------------------------ -3 1 х∈[-3;1] 2)(2x+1)²>0 x=-1 + + ------------------------------------------- -1 x∈(-≈;-1)U(-1;≈)