Respostas

2014-07-23T10:07:16-03:00
-b/a + c/a = 1
 \frac{c - b}{a} = 1

x² - mx - 5 = 0

 \frac{-5 - m}{1} = 1 \\ 
-m = 6 .(-1) \\ 
m = -6
2 5 2