Respostas

2014-03-10T16:49:46-03:00
F(x) = -3x + 2;

a) F(x) = 0 => -3x+2=0 => -3x = -2 => x = -2/-3 => x = 2/3.

b) F(x) = 11 => 
 -3x+2=11 => -3x = 11-2 => x = - (9/3) => x = - 3.

c) F(x) = -1/2 =>  -3x+2=-1/2 => -3x =-1/2 -2 => -3x = 2(-2)-1/2 => (-3x = -5/2). (-1) => x = (5/2)/3 => x = (5/2).(1/3) => x = 5/6.