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28 March, 21:03

If a2 = 18 and a4 = 8, find two possible common ratios. Then, write two sequences lhaving five terms each.

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  1. 28 March, 23:50
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    common ratio = a4/a3 = a3/a2

    8/a3 = a3/18

    (a3) ^2 = 8 * 18

    (a3) ^2 = 144

    a3 = 12 or a3 = - 12

    common ratio = 8/12 or common ratio = 8 / (-12)

    common ratio = 2/3 or common ratio = - 2/3

    Answer: 12 or - 12
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