Question

(x+1)2+(x-1)2+2(x+1)(x-1)

Answer 1

Resposta:

$2x^2+4x-2$

$(x+1)2+(x-1)2+2(x+1)(x-1)=\\2x+2+2x-2+2(x^2-x+x-1)=\\4x+2x^2-2=\\2x^2+4x-2$