What is the explicit formula for the sequence: 8, -20, 50, -125?

1 Answer
Alan P.
Mar 20, 2016

a_n=8*(-5/2)^n, n>=0

Explanation:

It is not possible to be certain with a limited sample sequence but this appears to be a geometric series with
color(white)("XXX")a_0=8
and
color(white)("XXX")a_i=a_(i-1)*(-5/2)
which would give the equation in the "Answer" above.

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