barisan geometri u3=24 dan u6=192.suku ke 8dari barisan itu

Dik. barisan deret geometri : u3 = 24 & u6 = 192.
Dit. U8?

Jawab...

U6 = a x r⁵ = 192
U3 = a x r² = 24
     ----------------------- (:)
@ r³ = 8
@ r = 2

a :
a x r² = 24
a x (2)² = 24
a x 4 = 24
a = 24/4 
@ a = 6

U8 = a x r⁷
U8 = 6 x (2)⁷
U8 = 6 x 128
U8 = 768 

Semoga membantu... ^_^