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1 September, 06:08

For the following geometric sequence, find the explicit formula. {1, - 3, 9, ... } an = - 3 · an - 1 where a1 = 1 an = - 3 · an - 1 where a1 = - 1 an = - 1 · (-3) n - 1 an = (-3) n - 1

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  1. 1 September, 07:17
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    { 1,-3,9 ... }

    an = a1 * r^ (n-1)

    a1 = first term = 1

    r = common ratio = - 3

    so ur formula is : an = 1 * - 3^ (n-1)
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