Diketahui:
U9 = a . r^8 = 128
U4 = a . r^3 = 4
Ditanyakan:
U10 = ... ?
Penyelesaian:
cari rasio
r^8/r^3 = 128/4
r^5 = 32
r = 2
suku pertama
a . r^3 = 4
a . 2^3 = 4
a . 8 = 4
a = 4/8
a = 1/2
U10 = a . r^9
U10 = 1/2 . 2^9
U10 = 1/2 . 512
U10 = 256
==================
Kelas: 9
Mapel: Matematika
Bab: Barisan dan Deret Bilangan
Kode: 9.2.2
Kata Kunci: Barisan geometri
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Verified answer
Diketahui:
U9 = a . r^8 = 128
U4 = a . r^3 = 4
Ditanyakan:
U10 = ... ?
Penyelesaian:
cari rasio
r^8/r^3 = 128/4
r^5 = 32
r = 2
suku pertama
a . r^3 = 4
a . 2^3 = 4
a . 8 = 4
a = 4/8
a = 1/2
U10 = a . r^9
U10 = 1/2 . 2^9
U10 = 1/2 . 512
U10 = 256
==================
Detil Jawaban
Kelas: 9
Mapel: Matematika
Bab: Barisan dan Deret Bilangan
Kode: 9.2.2
Kata Kunci: Barisan geometri