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Thread: A Simple Equation that i cant solve

  1. Apr 23rd, 2003, 04:58 AM #1
    r52
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    A Simple Equation that i cant solve

    3^(2x-1) = 9^-x

    Im having real problems with this equation i know its extremely simple but i cant find any information on the procedure to solve it. I know some basic laws of indices but this has both an X and a Y in it, whereas ive only got rules for an X.

    Any help would be much appreciated
    cheers
    r52
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  2. Apr 23rd, 2003, 07:24 AM #2
    Shaunak
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    Given:
    3^(2x-1) = 9^(-x)

    Solution:
    3^(2x-1) = 3^(-2x) because 3^2 = 9
    now 2x-1 = -2x
    thefore x = 1/4

    Regards
    Shaunak
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  3. Apr 23rd, 2003, 07:56 AM #3
    r52
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    thanks

    thanks for the help with that one! really appreciate it...
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