# Prove that the following a geometric sequence 1, 5, -25, 125,…

Prove that the following a geometric sequence 1, 5, -25, 125,…
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fitte8b
In a geometric sequence, you have to multiply (or divide) with a constant number.
If the sequence was −1,5,−25,125..., it would have been a geometric sequence, because you are always multiplying by (−5).
In the sequence (1,5,−25,125), you start by multiplying by 5, followed by multiplying with (−5)
Its not a geometric sequence