Question 1081596
<pre>

To find out if it is a geometric sequence, 
we find out whether this is completely true:

{{{matrix(1,5,

matrix(1,2,2nd,term)/matrix(1,2,1st,term),
""="",
matrix(1,2,3rd,term)/matrix(1,2,2nd,term),
""="",
matrix(1,2,4th,term)/matrix(1,2,3rd,term))}}}

{{{matrix(1,5,

(-4)/2,
""="",
(-16)/(-4),
""="",
(-36)/(-16)
)}}}

{{{matrix(1,5,

-2,
""="",
4,
""="",
9/4
)}}}

That's false, so it's not a geometric sequence.

Edwin</pre>