Question

PLEASE HELP
Which of the following is the formula for the geometric sequence?

8, -16, 32, -64,...

Answer 1

use the formula \[\huge a_n = a_1 r^{n-1}\]

Answer 2

You can make a direct formula for this too ^.^

Answer 3

First find a0 which would be 8/-2 = -4

Answer 4

\( \color{Black}{\Rightarrow a_n = a_0r^n}\)

Answer 5

So it's explicit now ^_^

Answer 6

thank you :)