SOLUTION: In a geometric sequence, the fourth term is -4, and the eighth term is -324. What is the tenth term?
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Question 695716: In a geometric sequence, the fourth term is -4, and the eighth term is -324. What is the tenth term?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
4th. term =-4
The nth term of a Geometric Progression is given by
-4=ar^3.................(1)
-324=ar^7...............(2)
Divide (2) by (1)
r=4
plug r=4 in (1)
-4=ar^3
-4=a*64
a=-1/16
t10= ar^9
t10 =-16384
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