Question

The following is a geometric sequence.
1, 5, -25, 125,…

True
False

Answer 1

nope

Answer 2

need a -1 at the start eh

Answer 3

looks like one but the - sign throws it off. formula for this looks like
\[an=(-1)^n a_{n-1}\]

Answer 4

even then it is not geometric yes? it alternates.

Answer 5

geometric looks like
\[a, ar, ar^2, ar^3,...\]

Answer 6

if r = -5 and it started with -1; that would be good right?

Answer 7

I believe amistre is correct.