Tentukan suku ke-8 dari setiap barisan geometri berikut! A. a = 8 dan u4 = 64 B. u5 = 1/2 dan u2 = 2 C. u3 = 32 dan u6 = 256 D. u3 = 32 dan u5 = 8 E. u4 = 162 d

A. a = 8 dan u4 = 64
r³ = 64/8 = 8
r = 2
U8 = 8 x 2^7 = 1.024

B. u5 = 1/2 dan u2 = 2


C. u3 = 32 dan u6 = 256
r³ = 256/32
r = 2
a = 32/2² = 8
U8 = 8 x 2^7 = 1.024

D. u3 = 32 dan u5 = 8
r² = 8/32
r = ½
a = 32/(½)² = 128
U8 = 128 x (½)^7
= 128/128
= 1

E. u4 = 162 dan u7 = 4374
r³ = 4374/162 = 27
r = 3
a = 162/27
a = 6
U8 = 6 x 3^7 = 13.122

F. u2 = 18 dan u5 = 486
r³ = 486/18 = 27
r = 3
a = 18/3 = 6
u8 = 6 x 3^7 = 13.122