Question

Kak tolong bantu jawab

Diberikan barisan geometri dengan suku ke 5 = 27 dan suku ke 9 = 432. Hitunglah suku ke 8

Answer 1

Verified answer

Mapel Matematika
Bab Baris dan Deret

Barisan Geometri
U5 = 27
ar^4 = 27

U9 = 432
ar^8 = 432
ar^4.r^4 = 432
27.r^4 = 432
r^4 = 16
r = 2

ar^4 = 27
a(2)^4 = 27
16a = 27
a = 27/16

U8 = ar^7
U8 =(27/16)(2)^7
U8 = (27/16)(128)
U8 = 216

Answer 2

Verified answer

U5 = ar^4 = 27
u9 = ar^8 = 432

r^8/r^4 = 432/27
r^4 = 16
r = 2

SUKU KE-8 (u8)
= u9/r
= 432/2
= 216.