Respostas

2014-03-31T11:00:07-03:00
1) 3x²-7x+2=0a=3, b=-7 e c=2  = (-7)²-4.3.2 = 49-24 = 25
2014-03-31T11:06:06-03:00
3x²- 7x +2 =0
3x²-7x=0-2
-4x²= -2
x²=-2/-4
x²=2
x=2/2 
x=1