Resposta :
[tex](x+1)^2+(x-1)^2-2(x^2-1)=\\\\(x+1)^2-2(x+1)(x-1)+(x-1)^2=\\\\\left[(x+1)-(x-1)\right ]^2=\\\\\left[x+1-x+1\right]^2=\\\\2^2=\\\\\boxed{4}[/tex]
(x+1)²+(x-1)²-2(x²-1)
X^2 + 2X + 1 + X^2 - 2X + 1 - 2X^2 + 2
2X^2 - 2X^2 + 2x - 2x +1+1+2
1 +1 + 2
4
X^2 + 2X + 1 + X^2 - 2X + 1 - 2X^2 + 2
2X^2 - 2X^2 + 2x - 2x +1+1+2
1 +1 + 2
4