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As suggested before, this article is a mess. I have started to fix it. However, the number of issues makes the work harder than I thought previously. Here are the main issues:
So, restructuring the article will take some time, and the global reason of my edits needs to be explicited.
I would appreciate feedback on the section that I have already rewritten. D.Lazard (talk) 09:16, 22 September 2019 (UTC)
In a preceding thread is has been suggested to split the article.
In december 2007, Cubic equation were merged into Cubic function, with almost no discussion. The main reason was that the "function" part was very short. This is no more true, specially after my recent additions, and my restructuration for grouping together the "function" sections. On the other hand, the "equation" part is very long. It can certainly be dramatically shortened by giving less details in the proofs, per MOS:MATH#Proofs. Nevertheless, even after this, the article would remain very long. This makes obsolete the argument for the past merge.
Another argument in favor of splitting is that the coefficients are always real in the "function" part, while most of the "equation" part does not depend on the nature of the coefficients.
My suggestion is to split the article into Cubic function and Cubic equation. Another suggestion would be to split out the various proofs of the cubic formula into a subpage. I am not convinced by this. In any case, such a split must be decided after having simplified the proofs, as suggsted above.
I could be bold, and proceed, but, as it is a strong restructuration, some further opinions would be helpful. D.Lazard (talk) 10:18, 24 September 2019 (UTC)
((u|Mark viking)) {Talk}
18:08, 24 September 2019 (UTC)Why has the solution section been removed from this page? The formulas in that section were so helpful in solving cubic polynomials Aminabzz (talk) 18:40, 26 September 2019 (UTC)
Thank you for your answer. I've seen the other article and I found it very good too. Aminabzz (talk) 21:00, 26 September 2019 (UTC)
Most of those now should point to the page on cubic equations. 73.89.25.252 (talk) 16:34, 6 August 2020 (UTC)
How do I solve cubic function given 4 points 41.13.200.129 (talk) 21:42, 24 February 2022 (UTC)