Question

resolva as equaçoes :(2x-2)!=720
b)x!=20 (x-1)!

Answer 1

Explicação passo-a-passo:

(2x-2)!=720

(2x-2)!=6!

2x-2=6

2x=6+2

2x=8

x=8/2

x=4

Verificando :

(2x-2)!=720

(2.4-2)!=720

(8-2)!=6!

(6)!=6!

720=720

ok!

b)x!=20.(x-1)!

x!=20.(x-1)!

x!/(x-1)!=20

x.(x-1)!/(x-1)!=20

x.(1)/1=20

x= 20

Verificando:

x!=20.(x-1)!

x!/(x-1)!=20

20!/(20-1)!=20

20!/19!=20

20.19!/19!=20

Cortando os dois 19!

20= 20

Espero ter ajudado!