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

Question

9 December, 01:09

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Neil Wilkins · Answer 1

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

Given the recursive formula for a geometric sequence find the common ratio, the first four terms, and the explicit formula.a1 = - 3an = - 3an-1