nilai n dari persamaan (n+3)!/(n+1)!=2!

Bab Faktorial
Matematika SMA Kelas X

(n + 3)! / (n + 1)! = 2!
(n + 3) x (n + 2) x (n + 1)! / (n + 1)! = 2
(n + 3) x (n + 2) - 2 = 0
n² + 5n + 6 - 2 = 0
n² + 5n + 4 = 0
(n + 1) (n + 4) = 0
n + 1 = 0
n = -1 (memenuhi)

n + 4 = 0
n = -4 (tidak memenuhi)

HP = { -1 }