Disequazioni Quadratiche (Spiegazione visiva)

Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2wj/ Traduzione in Italiano del video Quadratic Inequalities (Visual Explanation) http://www.youtube.com/watch?v=xdiBjypYFRQ http://www.khanacademy.org/video/quadratic-inequalities--visual-explanation?playlist=Algebra Help us caption & translate this video! http://amara.org/v/B2wj/