1. The problem statement, all variables and given/known data trying to prove left-hand side = right-hand side this is where i'm stuck: [tex] 1 - [1 / (x+1)!] + [(x+1) / (x+2)!] = 1 - [1 / (x+2)!] [/tex] 2. Relevant equations 3. The attempt at a solution i tried this but can't get anywhere get a common demoninator: 1 - [(x+2)! + (x+1)*(x+1)! / (x+1)!*(x+2)!] anyone seeing what i'm not seeing?