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UV_132654651-Visitor
1-Visitor
Apr 14, 2025 9:39 AM UTC
Question

Help me to solve higher order differential

Hello PTC community,

Greetings,

I would like to d K(fx)/dfx=0 and find fx value. How can I do that?

UV_13265465_0-1744623209351.png

I have attached file also for reference.

Thanks in advance.

Regards

UV

4 replies

Cornel19-Tanzanite
19-Tanzanite
Apr 14, 2025 10:09 AM UTC

Cornel_0-1744627551147.png

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    UV_132654651-VisitorAuthor
    1-Visitor
    Apr 15, 2025 5:19 AM UTC

    Hi Cornel,

    Thank you for your time and response. It means a lot.

    Regards

    Utham

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    Werner_E
    Werner_E25-Diamond I
    25-Diamond I
    Apr 14, 2025 11:55 AM UTC

    As Cornel already had shown, you may use the symbolic "solve" to get all solutions.

    In case you are only interested in real valued solutions, you may use an appropriate "assume" modifier:

    Werner_E_0-1744631318472.png

    Or if you are interested in the positive solution only, you may use

    Werner_E_1-1744631355421.png

    Apart from the symbolic "solve" you can also use a solve block with "find" or the "root" function.

    If you evaluate symbolically, you will get all (real valued) solutions

    Werner_E_2-1744631422205.png

    If you evaluate numerically, you get just one solution depending on the interval you provide

    Werner_E_3-1744631484094.png

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      UV_132654651-VisitorAuthor
      1-Visitor
      Apr 15, 2025 5:23 AM UTC

      Hi Werner,

       

      Yes, exactly I was looking at real value. thanks for the keyword suggestion.

       

      Regards,

      Utham

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