Question

Identify the 8th term of the geometric sequence -2, -12, -72 ...

Answer 1

a) -3,359,232
b) -559,872
c) 559,872
d) 3,359,232

Answer 2

the rule is this

ar^0+ar^1+ ar^7
1 2 8

Answer 3

you your first term ar^0=-2 however

r^0=1 so you ogt a*1=-2 or just a=-2
---
knowing a=-2
we plug that into your 2nd term to find r

-2r=-12
r=6

*note that r^1=r
---
we no know a and r and apply to the 8th term

-2*6^7=-559872