Respostas

  • Usuário do Brainly
2014-08-11T14:33:45-03:00
A) F(x) =3x + 12
3x + 12 = 0
x = -12/3
x = -4
b) F(x) = 5x+7/5
5x + 7/5 = 0
5x = -7/5 
25x = - 7
x = -7/25
1 5 1