Hi i'm studying linear algebra, first of all sorry for screen shots if it's not a good idea but I don't know how to write a matrix in StackExchange.

So question gave me A Matrix and I have to find its inverse so I got the inverse :

A Matrix and its inverse

And Now I have to solve this "A.X = B" :


I'm not sure how I should solve this, should I Multiply Matrix A inverse with 4-vector column Matrix B ? to find Matrix X ?




What happens when you multiply the equation $AX=B$ by $A^{-1}$ from the left?

  • $\begingroup$ well A-inverse times A well give Identity matrix ? then ? $\endgroup$ – Hussein Reda AlBehary Dec 8 '15 at 22:24
  • $\begingroup$ @HusseinRedaAlBehary I said multiply the EQUATION $\endgroup$ – 5xum Dec 8 '15 at 22:26
  • $\begingroup$ AA-inverseX = B*A-inverse ? $\endgroup$ – Hussein Reda AlBehary Dec 8 '15 at 22:29
  • $\begingroup$ @HusseinRedaAlBehary FROM THE LEFT! Please read everything I write. $\endgroup$ – 5xum Dec 8 '15 at 22:32
  • $\begingroup$ I started from the left ! $\endgroup$ – Hussein Reda AlBehary Dec 8 '15 at 22:33

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