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U6 = ar⁵ = 486
⇒ eliminasi:
ar⁵ = 486
ar² = 18
-------------- :
r³ = 27
r = ∛27
r = 3
⇒ subtitusi:
ar² = 18
a(3)² = 18
9a = 18
a = 18/9
a = 2
⇒ suku ke-8
Un = ar^(n-1)
U8 = 2 3^(8-1)
U8 = 2 3^7
U8 = 2 * 2187
U8 = 4374
U₃ = a r² = 18 persamaan 1
U₆ = a r⁵ = 486 persamaan 2
difaktorkan
ar² . r³ = 486
18 . r³ = 486
r³ = 486/18
r =∛27
r = 3
lalu subtitusikan
a r² = 18
a 3²= 18
a= 18/9
a= 2
maka
U₈ = a r⁷
U₈ = 2 3⁷
U₈ = 2. 2187
U₈ = 4373
jadu suku ke-8 nya bernilai 4373