Răspuns:
a)f2=0
f8=18
f5=9
0+18/2-9
=9-9
=0
f(2)=3•2-6 =>f(2)=0
f(8)=3•8-6 =>f(8)=18
f(5)=3•5-6 =>f(5)=9
(0+18)/2 - 9 = 0
f(-1)=3•(-1)-6=(-9)
3x-6 < -9
3x < -9+6
3x < -3
x < -1
x € (-infinit, -1)
