Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2we/ Traduzione in Italiano del video Introduction to the quadratic equation http://www.youtube.com/watch?v=IWigvJcCAJ0 http://www.khanacademy.org/video/introduction-to-the-quadratic-equation?playlist=Algebra Help us caption & translate this video! http://amara.org/v/B2we/