Respostas

2013-08-12T12:24:51-03:00
Delta = b^2 - 4.a.c = 49

x= -b +ou- raiz 49 / 2a
x' =  -1 + 7/ -6 = -1
x"= -1 - 7/ -6 = -8/-6

1 3 1
2013-08-12T12:39:49-03:00
-3x²+x+4=0
delta= 1²-4 x (-3) x 4
delta=1+48
delta=49

-b+ou-
 raiz de 49 / 2xa

-1+ou-7/ -6

x1= -1+7/-6=-1

x2= -1-7/-6= -8/-6 simplificando por 2 dá -4/-3