MATLAB Programming Fundamentals - MathWorks

Finding Higher Order Roots

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Once you get past n= 3, things get even trickier. For 4th roots we could use the quartic

formula discovered by Lodovico Ferrari in 1540. But this formula is long and unwieldy,

and doesn't help us find roots higher than 4. Luckily, there is a better way, thanks to a

17th century French mathematician named Abraham de Moivre.

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