Respostas

2014-09-02T19:43:54-03:00
Y = - x² + 2x + 8
x² - 2x - 8
baskhara: (- 2 +/-   \sqrt{-2^{2} - 4.1. (-8)})/ 2
- 2 +  \sqrt 36/2 = -2+6/2 = 4/2 = 2
- 2 - 6 /2 = -8/2 = -4

x' = 2
x'' = -4