Since you have provided me with • symbol I must assume it's about function multiplication, but since standard keyboard doesn't have the function composition symbol [tex]\circ[/tex] I must assume you meant either.
1. Case you meant multiplication.
[tex](f\cdot g)(x)=3x^2\cdot(x+2)=\boxed{3x^3+6x^2}[/tex]
2. Case you meant composition.
[tex](f\circ g)(x)=f(g(x))=f(x+2)=3(x+2)^2=\boxed{3x^2+12x+12}[/tex]
Hope this helps. Next time please use LaTeX to format your equations so that others can give you answers as well.
