Question 1165164
Find: g(f) and f(g(-2))
Using f(x)=2x+3 and g(x)=x^2-4

First solve g(-2) it means find g when x=-2
{{{g(x)=x^2-4}}}
{{{g(-2)=(-2)^2-4}}}
g(-2) = 0

Then solve f(g(-2)) or f(0) it means find f when g(-2)=0
{{{f(x)=2x+3}}}
{{{f(0)=2(0)+3}}}
f(g(-2)) = 3 

Then solve g•f it means g of f g(f)
since f=3
{{{g(3) =3^2-4}}}
g•f = 5


HOPE IT HELPS!