Here's the complete derivation of the cubic formula for ax^3+bx^2+cx+d=0. We will first review the formula for the quadratic equation x^2+px+q=0. Then we will take three main steps to solve the cubic equation. This ultra-algebra proof is a must-see for any math enthusiast looking to expand their knowledge and deepen their understanding of the roots of cubic equations. See my Patreon for my hand-written notes: https://www.patreon.com/posts/notes-on-cubic-81794694 de Moivre quintic formula 👉 https://www.youtube.com/watch?v=L8W684pCHyc 0:00 we will derive the cubic formula 0:07 review on solving the quadratic equation x^2+px+q=0 and the pq-formula 6:17 part1, get rid of the x^2 term in the y-world (let x=y-b/(3a)) 17:23 part 2, solving y^3+py+q=0 (let y=z-p/(3z)) 39:27 part 3, put everything together #maths #imaginarynumber #blackpenredpen 🛍 Shop math t-shirts & hoodies: null 10% off with the code "WELCOME10" ---------------------------------------- 💪 Support the channel and get featured in the video description by becoming a patron: https://www.patreon.com/blackpenredpen AP-IP Ben Delo Marcelo Silva Ehud Ezra 3blue1brown Joseph DeStefano Mark Mann Philippe Zivan Sussholz AlkanKondo89 Adam Quentin Colley Gary Tugan Stephen Stofka Alex Dodge Gary Huntress Alison Hansel Delton Ding Klemens Christopher Ursich buda Vincent Poirier Toma Kolev Tibees Bob Maxell A.B.C Cristian Navarro Jan Bormans Galios Theorist Robert Sundling Stuart Wurtman Nick S William O'Corrigan Ron Jensen Patapom Daniel Kahn Lea Denise James Steven Ridgway Jason Bucata Mirko Schultz xeioex Jean-Manuel Izaret Jason Clement robert huff Julian Moik Hiu Fung Lam Ronald Bryant Jan Řehák Robert Toltowicz Angel Marchev, Jr. Antonio Luiz Brandao SquadriWilliam Laderer Natasha Caron Yevonnael Andrew Angel Marchev Sam Padilla ScienceBro Ryan Bingham Papa Fassi Hoang Nguyen Arun Iyengar Michael Miller Sandun Panthangi Skorj Olafsen Riley Faison Rolf Waefler Andrew Jack Ingham P Dwag Jason Kevin Davis Franco Tejero Klasseh Khornate Richard Payne Witek Mozga Brandon Smith Jan Lukas Kiermeyer Ralph Sato Kischel Nair Carsten Milkau Keith Kevelson Christoph Hipp Witness Forest Roberts Abd-alijaleel Laraki Anthony Bruent-Bessette Samuel Gronwold Tyler Bennett christopher careta Troy R Katy Lap C Niltiac, Stealer of Souls Jon Daivd R meh Tom Noa Overloop Jude Khine R3factor. Jasmine Soni L wan na Marcelo Silva Samuel N Anthony Rogers Mark Madsen Robert Da Costa Nathan Kean Timothy Raymond Gregory Henzie Lauren Danielle Nadia Rahman Evangline McDonald Yuval Blatt bbaa Joash Hall ---------------------------------------- Thank you all!