Optimization is explained completely in this calculus video. I also provided the links for my other optimization videos as well.
Optimization - "minimum sum of two numbers" example
https://www.youtube.com/watch?v=WJy3EEJPV3g
Optimization - "Maximum volume of box" example https://www.youtube.com/watch?v=no4Ph76kNdM
Optimization - "Minimum time to cross river" example https://www.youtube.com/watch?v=7bFSjr9lOhE
Optimization - "Maximum profit" business example https://www.youtube.com/watch?v=yIRFON453Cg
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