Respostas

2014-07-14T19:53:07-03:00
(2x)² + 2 . (2x) . (1) + (1)²
4x² + 4x + 1.

(x)² - 2 . (x) . (5) + (5)²
x² - 10x + 25. 

4x ² + 4x + 1 + x² - 10x + 25 
4x² + x² + 4x - 10x = -25 - 1
5x² -6x = -26
5x² - 6x + 26 = 0. 
1 4 1