Question

Resolva as equações:

A) x!=15 (x-1)!
B) (n-2)! = 2 (n-4)!
C) (n-2) =720!
D) (x+1)!
(x-1)!
E) (x+3) ! + (x+2)!=8(x+1)

Answer 1

Oi 

a) 

x!  = 15*(x - 1)!
x*(x - 1)! = 15*(x - 1)!
x = 15

b)

(n - 2)! = 720 
(n - 2)! = 6!
n - 2 = 6
n = 8

d)

(x + 1)!/(x - 1)! = (x + 1)*x*(x - 1)!/(x - 1)! = x² + x

e)

(x + 3)! + (x + 2)! = 8*(x + 1)

x = 0

3! + 2! = 6 + 2 = 8 

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