Dik bil geometri (x+4) (x-2) (x-6) Berapa nilai x dan rasionya

Penyelesaian:

deret geometri:
barisan bilangan: (x+4), (x-2), (x-6), ...
(x-6)/(x-2) = (x-2)/(x+4)
(x-6)(x+4) = (x-2)(x-2)
x² - 2x - 24 = x² - 4x + 4
2x = 28
x = 14

barisan bilangan: (14+4), (14-2), (14-6), ...
barisan bilangan: 18, 12, 8, ...

rasio = 18r = 12
rasio = 2/3