Respostas

2014-02-24T08:22:15-03:00
A)f(x)=x+3
-2 + 3 = 1
-1 + 3 = 2
1 + 3 = 4
2 + 3 = 5

b)f(x)=2x 
2 . -2 =  -4
2 . -1 = -2
2 . 1 = 2
2 . 2 = 4

c)f(x)=2^x \\ \\ 2^{-2} = (\frac{1}{2})^{2} = \frac{1}{4} \\ 2^{-1} = (\frac{1}{2})^{1} = \frac{1}{2} \\  2^{1} = 2 \\ 2^{2} = 4 \\

d)f(x)=x^2
-2^2 = 4
-1^2 = 1
1^2 =1
2^2 = 4