Respostas

2013-11-16T21:42:42-02:00
A)

3x-5x+3 = 
3.2 - 5.2 + 3 = 
6 -10 + 3 = 
-4 + 3 = 
-1

b)

3x-5x+3 = 
3.-1 - 5.-1 + 3 =
-3 + 5 + 3 = 
2013-11-16T21:45:55-02:00
F(x)=3x-5x+3
f(2)=3(2)-5(2)+3
f(2)=-1

f(-1)=3(-1)-5(-1)+3
f(-1)=5