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March 28, 2017

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Insert three geometry means between 1 and 81. I can't even solve it.

  • Please...help me over here.,Sequence and series - ,

    remember the terms of a geometric sequence run like this:
    a ar ar^2 ar^3 ...

    so we
    1 , r, r^2, r^3, 81

    term(5) = 81
    r^4 = 81
    r = ± 3

    so the sequence is
    1, 3, 9, 27, 81
    or
    1, -3, 9, -27, 81

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