|x+1|^2 +2|x+1|-3<0

|x+1|²+2|x+1|-3<0
x²+2x+1+2x+2-3<0
x²+4x+0<0

x_1,2<(-b±√(b²-4ac))/2a
x_1,2<(-4±√(4²-4(1)(0)))/2(1)
x_1,2<(-4±√(16-0))/2
x_1,2<-4±4/2
x₁<0
x₂<-4