Respuesta :

Answer:

see explanation

Step-by-step explanation:

To find f(g(x)) substitute x = g(x) into f(x), that is

f(g(x))

= f(x² + 2x)

= 2(x² + 2x)² ← expand

= 2([tex]x^{4}[/tex] + 4x³ + 4x²) ← distribute

= 2[tex]x^{4}[/tex] + 8x³ + 8x²