Question

Pada barisan geometri diketahui U³ = 30 dan U6 = 810, maka suku ke 4 adalah

Answer 1

Verified answer

U3 = ar²= 30
u6= ar^5 = 810

cari r
ar^5 / ar² = 810/30
r³= 27
r= 3

u4 = u3 . r
= 30. 3
= 90

semoga mmbantu

Answer 2

Verified answer

MAPEL: MATEMATIKA
BAB: BARISAN DAN DERET


Jawab:
u3= a.r^3-1 = 30
u3= a.r^2 = 30

u6= a.r^6-1 = 810
u6= a.r^5 = 810

a.r^5 = 810 / a.r^2 = 30
=> r³ = 810/30
=> r³= 27
=> r = ³√27
=> r = 3

u4= u3×r
u4= 30×3
u4= 90


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