Respuesta :

inspirationalgdandyt

Answer:

A.2x^2 + 12x

Step-by-step explanation:

Here,
f(x) = 1/2 x^2 + 3x
Now,
4.f(x) = 4(1/2 x^2 + 3x) = 4/2 x^2 + 12x = 2x^2 + 12x