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Verified answer
Diketahui barisan geometri 4,-12,36,-108...Ditanya suku ke 9...
r = -12/4 = -3
u9 = ar^9-1
= ar^8
= 4 . (-3)^8
= 4 . 6561
= 26244
Verified answer
4 , - 12 , 36 , -108dit : u9?
r = -12/4 = -3
s9 = a (1-r^n ) / 1-r
s9 = 4 (1-(-3)^9 / 4
s9 = 4 (1- 19683) / 4
s9 = 4 (-19682) / 4
s9 = 78.732 / 4
s9 = 19683
dengan un :
r = 36/-12 = -3
a = 4
a.r ^n-1
4 . -3 n-1
tentukan u-9 ???
U9 = 4 x -3^8
U9 = 4 x 6561
U9 = 26.244