Respuesta :

Do FOIL. Front, outside, inside, then last. The answer you will get is A, 3x^3+27x^2+7x+63.

Answer: A

Step-by-step explanation:

Distribute 3x^2 into (x +9) first:

3x^2 × x = 3x^3

3x^2 × 9 = 27x^2

Next distribute 7 into (x+9):

7 × x = 7x

7×9 = 63

Add any like terms (none in this problem)

3x^3 + 27x^2 + 7x + 63