Question

Determine a Im(f) quando: f(x)= 2x-2 *

Answer 1

F(x)=2x-2

F(-1)=2.(-1)-2
-2-2
=-4

F(0)=2.0-2
=-2

F(2)= 2.2-2
4-2
=2

Ou seja,

Im(f)={-4,-2,2}