Vieta theorem formula: unary quadratic equation ax? +bx+c=0(a, B, C are real numbers, a≠0), where are the two X's? 、x？ The relationship is x? +x？ =-b/a，x？ x？ =c/a .
The reasoning process of this formula is as follows:
The most important contribution of Vieta's theorem is the promotion of algebra. Firstly, he systematically introduced algebraic symbols, promoted the development of equation theory, replaced unknowns with letters, and pointed out the relationship between roots and coefficients. Vieta's theorem laid a foundation for the study of the unary equation in mathematics, and created and opened up a broad development space for the application of the unary equation.
Vieta theorem can be used to quickly find out the relationship between the roots of two equations. Vieta theorem is widely used in elementary mathematics, analytic geometry, plane geometry and equation theory.
Introduction to Vedas:
Francois Viete (Fran? Ois Viète,1540-1603)1540 was born in poitou. 1603 12 13 died in Paris. When I was young, I studied law, worked as a lawyer, later engaged in political activities, worked as a member of parliament, and deciphered the enemy's code for the government in the war against Spain. David is also devoted to mathematical research. He was the first to consciously and systematically use letters to represent known numbers, unknowns and their powers, which brought great progress to the theoretical research of algebra.