Răspuns:
x+1=x²-2x+1
x= x²-2x
x-x²+2x=0
3x-x²=0
x×(3-x)=0
-> x=0
3-x=0=> x=3
-> radical din 0+1= 0-1
radical din 3+1=3-1
->1=-1 => Fals
2=2 => x=3
