Perfect Competition Problem 2: Solving Competitive Firm's Supply

I solve for the competitive firm's supply equation, with q as a function of P, from a cubic cost equation.
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[@ft919]

This is amazing please continue this

[@EconomicsinManyLessons]

Thank you!

[@SureshKumar-mh2yn]

Excellent video Sir thank you again

[@deltac34]

nice, thanks

[@EconomicsinManyLessons]

You are welcome!

[@sumasuma6805]

Is it about short run or long run? How to identify?