Question

simplifique: (n+1)!/(n-1), com n>=1.

Answer 1

(n+1) n (n-1)!/(n-1)!
cancelar o fatorial
=(n+1) n
= n²+ n

Answer 2

$\frac{(n+1)!}{(n-1)!} = \frac{(n+1)n(n-1)!}{(n-1)!} = (n+1).n = n^{2}+n$

Espero ter ajudado!