Answer:
g(2)=3(2)^2 = 12
g(-3) = 3(-3)^2 =27
[tex] \longmapsto \boxed{g(x) = 3 {x}^{2}} \\→ g(2) = 3 {(2)}^{2} = 3 \times 4 = \boxed{12} ✓\\ →g( - 3) = 3 {( - 3)}^{2} = 3 \times 9 = \boxed{27}✓[/tex]