Question

How do you multiply `((2, 3, -1), (-1, 0, 5))` with `((1, 0, 2), (1, 2, 1), (3, 5, 3))`?

Answer 1

The first matrix lets call it `A=((2, 3, -1), (-1, 0, 5))` is a 2 row by 3 column matrix and the second `B=((1, 0, 2), (1, 2, 1), (3, 5, 3))` is a 3 row by 3 column matrix.

Their product will be 2 rows by 3 columns matrix `C`.

You multiply the first row of A with each column in B and then the second row of A with each column in B. Hence you get

`C=A*B=((2 ,1, 4),(14,25,13))`