Question

Simplifique a explessao (x + 2) ² + (x + 2) . (x - 2) + (x - 2) ²

Answer 1

$\boxed{\begin{array}{l}\sf(a+b)^2+(a+b) (a-b) +(a-b)^2\\\sf=3a^2+b^2\\\sf (x+2)^2+(x+2)(x-2)+(x-2)^2\\\sf =3x^2+(-2)^2=3x^2+4\end{array}}$