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u7 + a = ar^6 + a = 585
a( r^10 – 1) / a (r^6 +1) = 9.207 / 585 = 1.023/65
(r^10 – 1) / (r^6 + 1) = 1023/65
dari sini sudah terlihat dapat langsung diselesaikan, karena 64 adalah faktor pangkat 6 :
r^10 – 1 = 1023
r^10 = 1024
r= 2
r^6 + 1 = 65
r^6 = 64
r = 2
a(r^6 + 1) = 585
a (65) =585
a= 9