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31 July, 19:17

Find an equation for the nth term of the sequence.

-4, - 16, - 64, - 256, ...

+4
Answers (2)
  1. 31 July, 22:26
    0
    Common ratio = 4

    Starts at - 4

    So the equation is n = - 4 * 4^ (n-1)
  2. 31 July, 22:38
    0
    This is a geometric sequence with first term a1 = - 4 and common ratio r = 4

    so nth term = a1 * r^ (n-1)

    = - 4 * 4^ (n-1)
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