Question

Tentukan u6 dari suatu barisan geometri jika diketahui u3 = 12 dan u7 = 972 . tolongggg bantu yah

Answer 1

Un = a x r^n-1
U3 = a x r^2
12 = a x r^2
a = 12 dibagi r^2

U7 = a x r^6
972 = (12/r^2) x r^6
972 = 12 x r^4
r^4 = 81
r = 3
a= 4/3

U6 = a x r^5
= 4/3 x 3^5
= 324