Question

Find an equation for the nth term of a geometric sequence where the second and fifth terms are -2 and 16, respectively.

Answer 1

err 1-2+4-8+16
so
(-1)^n*2^n

Answer 2

or (-2)^n
...

Answer 3

@zzr0ck3r these are my possible answers:
(a) an = 1 • (-2)n - 1

(b) an = 1 • 2n

(c) an = 1 • (-2)n + 1

(d) an = 1 • 2n - 1

Answer 4

@zzr0ck3r??

Answer 5

do you consider n to be natural?

Answer 6

yes

Answer 7

n = the term