Question

Cat fac X la pătrat +mX+n toată paranteza la patrat

Answer 1

$(x^2+mx+n)^2 = [(x^2+mx)+n]^2 = \\ \\= (x^2+mx)^2 + 2(x^2+mx)\cdot n+n^2= \\ \\ = x^4+2mx^3+m^2x^2 + 2nx^2 + 2m nx + n^2$