Question

Cum se restrange X²+x+1 ?

Answer 1

x²+x+1=0.
Calculam delta= 1-4=-3 cu radical din delta = 3i.
Ecuatia nu are solutii in R, dar are in C(multimea nr. complexe).

x1=(-1+i√3)/2
x2=(-1-i√3)/2

Deci se restrange la :
[x-(-1+i√3)/2]*[x-(-1-i√3)/2]