Respuesta :

Answer:

It's A  3x^2 + 6.

Step-by-step explanation:

(f-g)(x) = f(x) - g(x)

= 4x^2 + 1 - (x^2 - 5)

= 4x^2 - x^2 + 1 + 5

= 3x^2 + 6.