what's the error I got here? why it is wrong? How should I make this right for post?

  • Hmm, I don't know. What a useless message.
    – halirutan Mod
    Commented Dec 3, 2019 at 10:26
  • 3
    However, if you wanted to post the question like this, it would have been closed because this is the site for the software Mathematica. Please ask purely math-related questions on math.stackexchange.
    – halirutan Mod
    Commented Dec 3, 2019 at 10:29
  • 4
    The problem may have been in the title. Common title problems are too short or already in use by another question. There would have been a floating explanatory message up by the title.
    – m_goldberg
    Commented Dec 3, 2019 at 15:10
  • If the equation $q^n+a_{n-1} q^{n-1} + \cdots + a_0 = 0$ has repeated roots, then you will also have terms containing $t^r$. Anyway, check out a textbook on ordinary differential equations and/or linear circuit theory.
    – mjw
    Commented Jan 31, 2020 at 14:46
  • LaTeX doesn't work over here?
    – mjw
    Commented Jan 31, 2020 at 14:48
  • @mjw, yes, it's only enabled for the main site, and not the meta site. Commented Apr 20, 2020 at 11:23


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