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Math Help - help simplifying an expression with exponents (I think the may be incorrect)

  1. #1
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    help simplifying an expression with exponents (I think book may be incorrect)

    Below are pictures of the problem in the book and how I simplified it.

    (2a^2 b)(-3a^-2 b^3)^2

    The books answer is -6b^7. I can't figure out how to get this answer. Is the book wrong? My answer is (18b^7)/a^2. Is my answer correct?
    Attached Thumbnails Attached Thumbnails help simplifying an expression with exponents (I think the  may be incorrect)-dsc03530.jpg   help simplifying an expression with exponents (I think the  may be incorrect)-dsc03529.jpg  
    Last edited by StudentMCCS; July 29th 2011 at 11:10 PM. Reason: typos
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  2. #2
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    Re: help simplifying an expression with exponents (I think the may be incorrect)

    Quote Originally Posted by StudentMCCS View Post
    The books answer is -6b^7. I can't figure out how to get this answer. Is the book wrong? Is my answer correct?
    1. If (and only if) you have copied the question correctly your answer is OK. But ...

    2. The answer in the book belongs to the question

    (2a^{2} b)(-3a^{-2}(b^3)^2)
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