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U5 = ar (pangkat 4) = 32
32/8 = ar (pngkat 4) / ar²
4 = r²
r = 2
ar² = 8
a × 2² = 8
4a = 8
a = 2
Sn = a (1-r(pangkat n))/ (1-r)
S9 = 2 ( 1- 2 (pngkat 9)) / (1-2)
S9 = 2 ( 1-512) / (-1)
S9 = 2 ( 511)
S9 = 1022
jadi jumlah sembilan suku pertama barisan tersebut adalah 1022