Respostas

2014-07-20T14:13:24-03:00
F(x)=-2x+15
f(8)=-2.8+15
f(8)= -16+15
f(8)= -1
1 1 1
2014-07-20T14:14:40-03:00
Só trocar o x pelo 8

f(8)= -2x +15 
f(8)= -2.(8) + 15
f(8)= -16 +15
f(8) -1
1 1 1