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Mathematics 15 Online
OpenStudy (anonymous):

Given matrix A with dimensions 5x3 and matrix B with dimensions 3x5, what are the dimensions of the product BA? Note: Please notice the ORDER of the multiplication!!

jimthompson5910 (jim_thompson5910):

In general, if A is an m x n matrix and B is a n x m matrix, then BA is a n x n matrix

jimthompson5910 (jim_thompson5910):

So what does that mean for this problem in particular?

OpenStudy (anonymous):

is it a 5x5?

jimthompson5910 (jim_thompson5910):

not quite

jimthompson5910 (jim_thompson5910):

that's the size of AB

OpenStudy (anonymous):

3x5?

jimthompson5910 (jim_thompson5910):

still no, what are the values of m and n?

jimthompson5910 (jim_thompson5910):

go back up to my first post

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