f(0)=-3*0+2=2
f(2/3)=-3*(2/3)+2=0
f(-1/3)=-3*(-1/3)+2=3
f(-3)=-3*(-3)+2=9+2=11
f(2/3)=-3*2/3+2=0
-1.5…
F(5)=-75
f(2a)=-12a^2
f(a+3)=-3a^2-18a-27
f(x^3)=?
f(0)=-3*0+2=2
f(2/3)=-3*(2/3)+2=0
f(-1/3)=-3*(-1/3)+2=3
f(0)=-3*0+2=2
f(-3)=-3*(-3)+2=9+2=11
f(2/3)=-3*2/3+2=0
f(-1/3)=-3*(-1/3)+2=3
-1.5…
F(5)=-75
f(2a)=-12a^2
f(a+3)=-3a^2-18a-27
f(x^3)=?
f(-x)=-3(-x)+2=3x+2
-f(x)=-(-3x+2)=3x-2
f(2x)=-3(2x)+2=-6x+2