Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2ws/ Traduzione in Italiano del video Proof: log_a (B) = (log_x (B))/(log_x (A)) http://www.youtube.com/watch?v=cKOtT4WnZb4 http://www.khanacademy.org/video/proof--log-a--b-----log-x--b----log-x--a?playlist=Algebra Help us caption & translate this video! http://amara.org/v/B2ws/