Respostas

2014-05-24T12:44:02-03:00
F(x) = -3x + 2

f(x) = 0 , então 

-3x + 2 = 0
-3x = 0 - 2
-3x = -2
x = -2 / -3
x = 2/3

f(x) = 11 , então 

-3x + 2 = 11
-3x = 11 - 2
-3x = 9
x = 9 / -3
x = -3

f(x) = -1/2 , então

-3x + 2 = -1/2
-3x = -1/2 - 2
-3x = 3/2
x = 3/2 / 3
x = 1/2
2 5 2