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a . r² = 80
U5 = 1280
a . r⁴ = 1280
a . r² . r² = 1280
80 . r² = 1280
r² = 1280 : 80
r = √16
r = 4
a . r² = 80
a . 4² = 80
a . 16 = 80
a = 80 : 16
a = 5
U9 = a . rⁿ⁻¹
U9 = 5 . 4⁹⁻¹
U9 = 5 . 4⁸
U9 = 327680