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A Chinese friend of mine asked me to have a look at this piece of mathematics.

I see a quadratic form and some kind of a sequence but I can't make out what is being done here.

Does anyone recognize this?

If I could just be directed to an English version that would be great.

enter image description here

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    $\begingroup$ This looks like Vieta's formulas: en.wikipedia.org/wiki/Vieta%27s_formulas $\endgroup$
    – carmichael561
    Aug 27, 2017 at 19:40
  • $\begingroup$ I've never studied or heard of Vieta's formulas but from the link it looks like that's exactly it. Time to learn Vieta's formulas. Thanks $\endgroup$
    – Kantura
    Aug 27, 2017 at 19:46

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