Question

resolva a equação
n! /( n-2)! =12

Answer 1

resolva a equação

n! /( n-2)! =12

n . (n-1). (n-2)
-------------------=12
(n-2)!


n . (n-1)=12


n^2 - n = 12

n^2 - n -12 =0

/\=b^2-4a.c

n= 1 +/- \/ 49 / 2


n'=1 + 7 / 2

n=4


n" 1 - 7 /2

n"= - 3