f:{-1,0,1,2]->R;f(x)=3x-2
f(f(-1))=-17
Calculam intai f(-1):3(-1)-2=-3-2
=-5
Acum calculam f(-5)=3(-5)-2
=-15-2
=-17
f(f(0))=-8
Calmculam intai f(0):3*0-2=0-2
=-2
Acum calculam f(-2):3*(-2)-2=-6-2
=-8
f(f(1))=1
Calculam intai f(1):3*1-2=3-2
=1
Acum calculam iar f(1) care este egal cu 1
f(f(2))=10
Calculam intai f(2)=3*2-2
=6-2
=4
Acum calculam f(4):3*4-2=12-2
=10
