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Math Help - Geometric Sequence, Determining common ratio.

  1. #1
    Newbie wtfmate's Avatar
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    Geometric Sequence, Determining common ratio.

    t2 = 480 and t7 = -15.
    Determine the common ratio, r.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by wtfmate View Post
    t2 = 480 and t7 = -15.
    Determine the common ratio, r.
    t3 = r t2
    t4 = r t3 = r^2 t2
    t5 = r t4 = r^3 t2
    t6 = r t5 = r^4 t2
    t7 = r t6 = r^5 t2.

    so:

    r^5 = t7/t2

    r = fithroot(t7/t2) = -0.5

    RonL
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