What nineteenth century French mathematician worked with quadratic formulas?

Answer 1

Evariste Galois worked on quadratics when he was a teenager. He was able to establish the means to solve quadratics using radicals and laid the ground work for what became Galois theory. Unfortunately, he died when he was only 20 years old during a duel.

Answer 2

Evariste Galois worked on quadratics when he was only a teenager. He was able to establish the means to solve quadratics using radicals and laid the ground work for what became Galois theory. Who knows what other contributions he could have made to mathematics. Unfortunately, he died when he was only 20 years old during a duel.