Respuesta :

Answer:

x⁷ + 9x⁴ - 9x³ - 81

Step-by-step explanation:

(f⋅g)(x) is just another way of writing f(x) ⋅ g(x).

f(x) ⋅ g(x)

(x⁴ - 9) (x³ + 9)

If you wish to simplify:

x⁷ + 9x⁴ - 9x³ - 81