Equação do 2º Grau Parte I: Exemplos e Definição

Synopsis: In this lesson we begin the study of equations of the 2nd degree. First, we present three examples of the resolution, with increasing level of difficulty, the solution lies in solving equations of 2nd degree and finally, we present a precise definition of such equations.
Source: Portal of Mathematics.
URL: http://matematica.obmep.org.br/index.php/modulo/ver?modulo=25#