Francois Viete

Francois Viete was born in 1540 in Fontenay le Comte, died on 23 February 1603. He was a French mathematician and astronomer.

He studied and practiced law, then worked as a teacher of science in the homes of the nobility and royal adviser and parliamentary (the Parliament of Brittany).

He dealt with algebra and trigonometry, formulated algebra formulas, allowing to solve quadratic equations.

 

Vieta’s formulas

If the quadratic equation ax² + b + c = 0 has roots x1, x2, are:

  x1 + x2 = - b/a and x1 ∙ x2 = c/a

 x1, x2 – roots - pierwiastkia, b, c - coefficient equation – współczynnik równania

He was the first to consistently apply the letter symbols in algebra, although its notation was significantly different from currently used.

  

He was a secret adviser at the court of Henry III and Henry IV

During the French-Spanish war, he broke the enemy codes.

Sources: http://forum.thesims.pl/archive/index.php/t-66267.html http://pl.wikipedia.org/wiki/Henryk_III_Walezy http://www.zamki.name/kraje/francja/henryk4.php http://forum.thesims.pl/archive/index.php/t-66267.html http://bibsy.pl/5f0WjbiI/bog-stworzyl-matematyke-diabel-dodal-do-niej-litery http://www.lagrangeetlhirondelle.fr/region_gb.html http://pl.wikipedia.org/wiki/Fran%C3%A7ois_Vi%C3%A8te

XX Secondary School in Gdańsk, PolandSupervision: Agnieszka Jackiewicz

Consultation: Maria Hebel, Jolanta Chamerska

Authors: Bartosz Uchman, Rafał Cichocki