miahicklen012 miahicklen012

08-02-2018
Mathematics

contestada

Write an explicit formula for the sequence 3,-9,27,-81

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sqdancefan sqdancefan

08-02-2018

The initial value is 3. The common ratio is -9/3 = -3. The general formula is
.. an = a1*r^(n-1)

So, for your values, ...
.. an = 3*(-3)^(n -1)

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