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I don't think this is new at all. This looks like just a standard proof of the quadratic formula. I believe most people probably have seen a variation of this
by finite_jest 5y ago
I don't think this is new at all. This looks like just a standard proof of the quadratic formula.
I believe most people probably have seen a variation of this in high school. Depending on your preferences, this might be a slightly better or worse presentation than what you have seen before.
The fact that they couldn't (or haven't) publish it in a journal also supports this. [1]. (The ArXiv pre-print [2] is dated December 16, 2019)
[1]: https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=%22A+Simple+Proof+of+the+Quadratic+Formula%22&btnG= https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=%22A...
[2]: https://arxiv.org/pdf/1910.06709.pdf https://arxiv.org/pdf/1910.06709.pdf
- jimhefferon 5y agoI think there is a different standard way in Europe, compared with the US. Dunno about other places.
- fifilura 5y agoI am from Europe (Sweden) an I learned it the way described in the article, so when I read it I had to read it twice to try to figure out what I was missing. But I had a very inspiring (or stubborn ymmv) maths teacher. He insisted that we learned sine cosine by drawing our own unit circle and measure from with a ruler. Calculators were forbidden.