Respostas

2013-09-12T19:17:38-03:00
Se A = (x + 1)2 + (x – 1)^2 
X^2 + 2 * x * 1 + 1^2 + X^2 - 2 * x * 1 + 1^2
x^2 + 2x + 1 + x^2 - 2x +1 =
(2x^2 +2) +  [ –2x(x + 1)] =
(2x^2 +2) -2x^2 -2 =
0
0