Answer:
see explanation
Step-by-step explanation:
(a)
Substitute x = g(x) into f(x) , that is
f(5x + 4)
= 3(5x + 4) - 2
= 15x + 12 - 2
= 15x + 10
(b)
note (g ￮ f)(x) = g(f(x))
Substitute x = f(x) into g(x) , that is
g(3x - 2)
= 5(3x - 2) + 4
= 15x - 10 + 4
= 15x - 6
