Question

How do you find nth term rule for `-28,14,-7,7/2,-7/4,...`?

Answer 1

`a_n = -28(-1/2)^(n-1)`

Explanation:

`(-7)/14 = -1/2 " and " 14/(-28) = -1/2`

It is a GP with `a_1 =-28` and Common ratio = `r =-1/2`

`a_n = ar^(n-1)`

`a_n = -28(-1/2)^(n-1)`