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Math Help - Need help simplifying these rational expressions

  1. #1
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    Need help simplifying these rational expressions

    (21 a^9 c^7)^-
    (81 a^5 b^6 c)^-

    I ended up with √((27b^6)/(7a^4c^6)) but I get the feeling I'm not doing it correctly.


    (-2 a^-1 b^6)^3
    (8 a^9 b^-12)^(-2/3)

    I don't even know where to start with this equation. How would I solve this?


    Thanks!
    Last edited by jaclyn9189; November 18th 2008 at 10:47 AM.
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  2. #2
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  3. #3
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  4. #4
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    Thanks so much, especially for writing out how you got the answer
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