Question

simplifique as expressões : A) (n+2)! + (n+1)×(n-1)!/(n+1)×(n-1)!

Answer 1

(n+2)! + (n+1)(n-1)! 
(n+1)(n-1)! 

(n+2)(n+1)n(n-1)! + (n+1)(n-1)! 
(n+1)(n-1)! 

(n+1)(n-1)!. [(n+2).n +1] 
(n+1)(n-1)! 

[(n+2).n +1] = n²+2n+1 = (n+1)²