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Math Help - Exponent question

  1. #1
    Newbie
    Joined
    Feb 2009
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    1

    Exponent question

    Hi everybody, I am looking for some help with the following question, it seems more or less easy, but is getting a little challenging for me.

    99^9/9^99 (for column A)
    11^9/9^90 (for column B)

    The answer states that both columns are equal, I've been trying using exponents rules, power rules and some factoring but I can't get it quite right.

    If someone could show how to prove that both columns are equal, it will end my lack of sleep
    thanks in advance to all
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  2. #2
    Member
    Joined
    Jan 2009
    Posts
    94
    99^9/9^99
    =(9*11)^9/9^99
    =(9^9*11^9)/9^99
    =11^9/9^(99-9)
    =11^9/9^90

    -O hopes.
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