Respostas

2014-02-03T23:35:46-02:00
(x - 4)² + 2(x + 3)² - ( x - 5)² 
x² - 8x + 16 + 2( x² + 6x + 9) - ( x² - 10x + 25)
x² - 8x + 16 + 2x² + 12x + 18 - x² + 10x - 25
x² - x² + 2x² - 8x + 12x + 10x + 16 +18 - 25
 2x² + 14x + 9