Either there is a typo in your post or the book has the wrong answer.

Your answer is on the right track but can still be simplified further. Remember that m-n=-(n-m).

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- July 28th 2008, 01:17 PM #1

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- July 28th 2008, 06:33 PM #2

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- July 28th 2008, 10:46 PM #3

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