Question

Persamaan n?
(n+2)! / n! = 72

Answer 1

(n+2) (n+1) (n)! / n!= 72
(n+2) (n+1) =72
n^2 + 3n + 2 = 72
n^2 + 3n -70 = 0 (persamaan)
n= -10 atau n = 7