Question

Efectuati: (x+2)²+(x-1)²

Answer 1

$x^{2} + 4x + 4 + x^{2} - 2x + 1 = 2x^{2} +2x + 5 = 2x(x+1) + 5$

Answer 2

Avem de aface cu 2 binomuri 

$\boxed{(a+b)^2=a^2+2ab+b^2}\\\boxed{(a-b)^2=a^2-2ab+b^2} \\ \\ (x+2)^2+(x-1)^2= \\ \\ x^2+2x2+2^2+x^2-2x1+1^2=\\\\x^2+4x+4+x^2-2x+1= \\ \\ \boxed{2x^2+2x+5 = }$