X la puterea a doua + x + 1 = 3

Răspuns :

x^2+x+1-3=0
x^2+x-2=0
delta=b^2-4ac=1-8= -7
x1=(-b+√delta)/2a= (-1+√7)/2
x2=(-b-√delta)/2a=(1-√7)/2