Expert: Abe Mantell - 8/22/2005

Question
 if matrix A=
              [ 2  5  -1 ]
              [ 3  -2  0 ]


and matrix B=
             [5 -3]
             [0  2]
             [-1 4]   then how do u find A+B?


also if they ask u wat is the order of [A] or the order of [B], what are they asking you to do?

thank u  

Answer
Hello LG,

First, this is not Basic Math...you should ask this
in the Linear Algebra section.

Anyhow, in order for matrices to be added, they must be
the same size.  Matrix A is 2x3 and B is 3x2, thus addition
is not defined for them.

As to the order, check this reference:
http://www.mathreference.com/la-mpoly,order.html
it only applies to square matrices.

Abe