There is a cubic function that passes (0,0). Find the absolute maximum of the function.

Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: There is a cubic function that passes (0,0). Find the absolute maximum of the function.

Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: There is a cubic function that passes (0,0). Find the absolute maximum of the function.
