@PhúcĐỗ Please do take a moment and write about what you think you know and what parts make you feel adrift with no idea where to go. All of us go through this in our own ways. If this whole problem is a mystery and you have no ideas at all about how to proceed, then you probably aren't ready and need to go back for more review. But if you know a few things, then write about that. Do you know how mathematicians find a "maximum" or "minimum?" Have you heard of the Maximum Power Transfer Theorem? Etc. Help us help you.
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