barisan geometri U2=6 dan U6=96, tentukan suku ke 9

Dik. barisan deret geometri : U2= 6 & U6 =96.
Dit. U9 ?

Jawab...

U6 = a x r⁵ = 96
U2 = a x r  = 6
     ---------------------- (:)
@ r⁴ = 16
@ r = 2

a :
a x r = 6
a x 2 = 6
a = 6/2 
a = 3 

U9 = a x r⁸
U9 = 3 x (2)⁸
U9 = 3 x 256
U9 = 768

Semoga membantu.... ^_^