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Homework Help: 4 by 4 Inverse Matrix

  1. Mar 16, 2008 #1

    Is there a standard equation for a 4 by 4 inverse? I know that one exists for 3 by 3, 2 by 2, but I cannot find one in my text nor in my searches online. I know I could find one by using the Jordan-Gaussian Method. But, I would be more comfortable with knowing a 4 by 4 general method/equation. I plan on doing alot of inverses for a 4 by 4.

    If you know of any resources, please help me. Also, if I should find this on my own by scratch, please help me.

    Thank You,
  2. jcsd
  3. Mar 16, 2008 #2


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    Yes, you should probably create an explicit formula on your own. You don't find it listed just because it's lengthy to write down. But it should be an obvious extension of the lower dimensional cases. It's a matrix of the determinants of the minors of the nxn matrix divided by the determinant of the whole matrix.
  4. Mar 17, 2008 #3

    Can you please provide some links to the n = 2 and n = 3 cases please? After that, I'll do the rest on my own. Thanks.

  5. Mar 17, 2008 #4


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