Respostas

2013-11-17T17:26:21-02:00
A) 4x²-4x+1=0
b² - 4.a.c
16 - 16 = 0

4 + 0 / 2.4 = 1
4 - 0 /2.4 = 1 

b)0x²+4x-3=0
16 - 0 = 16

-4 + 16 = 12
-4 - 16 = -20