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U4 = 8
r² = 91,125
r = √91,125 = 9,545
Mencari nilai a :
U4 = a.r³
8 = a. 9,545³
8 = a. 869,616
a = 8/869,616 = 0,00091999
Itu soalnya gak salah ya :D
Good Luck! :D