Respostas

2014-06-10T14:49:39-03:00
(5x² - 9x - 8) - (-3x² + 10x - 6) =
5x² - 9x - 8+ 3x² - 10x + 6 = 
8x² - 19x + 6 

2014-06-10T15:03:00-03:00
5x²-9x-8+3x²-10x+6


8x²-19x-2