Respostas

2013-11-18T13:39:35-02:00
A)  F(x)= 3 . (x). 2 + 5 . (x) - 2 =

F (-2) = 3. (-2) . 2 + (-2) - 2 =
F (-2)=  - 12 -4=
F (-2) = -12 -4 = -8
 

B) F(x) = 3 . (x) . 2 + 5. (x)- 2=
F(1/3) = 3 . 1/3 . 2 + 5. 1/3 -2=
F (1/3) = 3/3 .2 + 5/3 -2=
F (1/3) = 6/3 + (-10/3)=
F (1/3)= -4/3


C)  F (x)= 3 . (x). 2 +5 . (x)-2=
F(-2/3)= 3. (-2/3) .2 + 5 .(-2/3) -2=
F(-2/3) = -5/3 .2 - 10/3 -2=
F (-2/3)= -10/3 +12/3=
F(-2/3) =-22/6

Acho que é isso ai, o jogo de sinal me confundi muito