Diketahui barisan geometri u2 = 4 dan u7 = 4.096. Tentukan u4

Dik. barisan geometri : U2= 4 & U7 = 4.096.
Dit. U4? 

Jawab...

U7 = a x r⁶ = 4096
U2 = a x r = 4
      ----------------------- (:)
@ r⁵ = 1024
@ r = [tex] \sqrt[5]{1024} [/tex]
@ r = 4 

a : 
a x r = 4 
a x 4 = 4 
a = 4/4 = 1

U4 = a x r³
U4 = 1 x (4)³
U4 = 1 x 64
U4 = 64

Semoga membantu... ^_^

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