This question is about the composition of functions.
Remember that a composition of two functions refers to one function inside of another, so the expression
[tex](f\circ g)(x)[/tex]means that function g(x) is inside f(x), so let's get that expression first
[tex](f\circ g)(x)=3((x+2))^2[/tex]Notice that we replaced g(x) inside the variable of f(x), that's the composition.
Additionally, the expression
[tex](f\circ g)(-5)[/tex]means that we need to substitute -5 for x, let's do it
[tex](f\circ g)(-5)=3(-5+2)^2=3(-3)^2=3(9)=27[/tex]