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February 8th, 2009, 01:28 AM  #1 
Newbie Joined: Jan 2009 Posts: 2 Thanks: 0  Is my answer the correct one?
Hi, I'm wondering if my answer is the correct one or not. If it is not correct can you help to find the right one. This is the example: 
May 26th, 2009, 05:15 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,629 Thanks: 2077 
It's incorrect. Consider more carefully what "+ 4" and "+ 1" should mean when applied to a matrix. Also, you gave the wrong sign to one of your figures.


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