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23-03-2017
Mathematics

contestada

Given the recursive formula for a geometric sequence find the common ratio, the first four terms, and the explicit formula.

a1 = -3
an = -3an-1

Respuesta :

25-03-2017

since a(n)=-3(a(n-1)) the common ratio is -3, and a(1)=-3 so

a(n)=-3(-3^(n-1)) so the first four terms are:

-3, 9, -27, 81

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