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16 May, 08:59

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

+3
Answers (1)
  1. 16 May, 11:42
    0
    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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