Respostas

  • Usuário do Brainly
2014-06-04T17:52:27-03:00


-3x²+ 7x -2 =0

3x² -7x +2 =0

Δ= 49 -24 = 25                 √Δ=5

x=( 7 + 5)/6= 12/6= 2

x = (7 - 5)/6 = 2/6 = 1/3                   

S= { 1/3,2}

2014-06-04T17:54:53-03:00
X(-3x+7) -2 =0
-3x² + 7x -2=0              a=-3
                                   b=7
  b² -4.a.c                      c= -2
 7²-4 .(-3) .(-2)
49 +12.(-2)
49-24=
25