Consider the cube shown. Its length of side is $x+4$.

Find the polynomial that represents the volume of the cube.
Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: Consider the cube shown. Its length of side is $x+4$.

Find the polynomial that represents the volume of the cube.
Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: Consider the cube shown. Its length of side is $x+4$.

Find the polynomial that represents the volume of the cube.