Respuesta :

adioabiola

Answer:

D. 3x² + 12x

Step-by-step explanation:

A. x² + 3x + 4

B. 3x² + 4

C. 3x3 + 12x

D. 3x² + 12x

Product of 3x(x + 4)

Product means to multiply

Given:

3x(x + 4)

= (3x * x) + (3x * 4)

= 3x² + 12x

The correct answer is D. 3x² + 12x