In the equation \( x^8 = 3(x + 4)^2 \), the expression that represents a product is \( 3(x + 4)^2 \).
This is because it includes the multiplication of \( 3 \) by \( (x + 4)^2 \).
The other options like \( 2, , 3, , x^8, , \frac{x}{8}, , \frac{3(x + 4)}{2}, \) and \( 3(x + 4) \) do not represent a complete product in the same way.
So the correct response is: \( 3(x + 4)^2 \).