Respuesta :

Answer:

21x + 19

Step-by-step explanation:

Substitute x = f(x) into g(x), that is

g(3x + 4) = 7(3x + 4) - 9 = 21x + 28 - 9 = 21x + 19

Answer:

21x + 19

Step-by-step explanation:

21x + 19

Substitute x = f(x) into g(x), that is

g(3x + 4) = 7(3x + 4) - 9 = 21x + 28 - 9 = 21x + 19