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:   / notes-on-cubic-81794694  

de Moivre quintic formula 👉    • de Moivre quintic formula  

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
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