# Is the following a geometric sequence 1, 5, -25, 125,…?

Nov 8, 2015

If the sequence was $- 1 , 5 , - 25 , 125. . .$, it would have been a geometric sequence, because you are always multiplying by $\left(- 5\right)$.
In the sequence $\left(1 , 5 , - 25 , 125\right)$, you start by multiplying by $5$, followed by multiplying with $\left(- 5\right)$