Răspuns:
E(x) = x^2 + 4042x + 2021^2 - 10x - 20210 + 21
= x^2 + 4032x +4084441 -20210 + 21
= x^2 + 4032x + 4064252
= x^2 + 2*2016x + 2016^2
=(x + 2016)^2
^ inseamna putere putere
* inseamna inmultire
sper ca te am ajutat mult succes
