Verified answer

2(t³+1)+(t+1)=0

2(t+1)(t^2-t+1)+(t+1)=0

(t+1)(2t^2-2t+2+1)=0

t+1=0⇒

t=-1

x=-√2

2t^2-2t+3=0

D<0 - нет корней

О т в е т. x=-√2