Fattorizzazione di Polinomi di Secondo Grado

Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2wa/ Esercizi: http://www.khanacademy.org/exercises?exid=solving_quadratics_by_factoring Traduzione in Italiano del video Solving a quadratic by factoring http://www.youtube.com/watch?v=N30tN9158Kc http://www.khanacademy.org/video/solving-a-quadratic-by-factoring?playlist=Algebra