Respostas

2013-11-19T00:20:03-02:00
C) x² +x+4=0

b² - 4ac = 
1² - 4.1.4 = 
1 - 16 = 
-15

-1 + 
√-15 / 2 = 

S =[ -1 + 
√15i / 2 ,  -1 - √15i / 2 ]

d) x - 5x + 6 =0

5² - 4.1.6 = 
25 - 24 = 
1

5 + 1 / 2 = 6/2 = 3

5 - 1 /2 = 4/2 = 2

S [ 3,2]