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ar^4 / ar² = 9
r² = 9
r = + 3
U3 = ar²
90 = a 9
a = 10
jika r = 3 maka
U8 = ar^7 = 10 x 3^7 = 21.870
jika r = -3 maka
U8 = ar^7 = 10 x (-3)^7 = -21.870
Rasio = 3,
Jadi, Suku ke 8 = 21870.
Maaf kalau salah..