Respostas

2014-08-03T11:26:51-03:00
A) f (1/3)= -3.(1/3)+4
--> -3+4
f (1/3)=1

b) f (-5) = -3.(-5)+4
--> +15 +4
f (-5)= +19

2) f (x)=-2x+5

3) 8x=2 --> x=1/4
1/4-5
f (2) = 1/4-5
f (2) = 1/4-20/4
f (2) = -19/4