Respostas

2014-07-10T18:36:49-03:00
X^2-2.x.3+3^2 - (4x^2-2.1.2x+1^2) + (x^2-5^2)
x^2 - 6x + 9 - 4x^2 + 4x +1 + x^2 - 25
2x^2 - 4x^2 - 6x + 4x + 1 + 25
-2x^2 - 2x + 26