To find the value of ( f ∘ g ) (4), we need to first substitute 4 into the definition of g(x) and then substitute the result into the definition of f(x).
First we substitute 4 into g(x):
g(4) = -2(4) + 15 = -8 + 15 = 7
Now we substitute 7 into f(x):
f(g(4)) = f(7) = 7^2 - 5(7) - 2 = 49 - 35 - 2 = 12
So the value of ( f ∘ g ) (4) is 12.