Question

Let `A = [(2,4),(3,2)] , B = [(1,3),(-2,5)], C = [(-2,5),(3,4)]`

Find BA

Answer 1

Matrix B has 2 columns. This number is equal to the number of rows in matrix A. Therefore, BA is defined as:

`BA = [(1,3),(-2,5)][(2,4),(3,2)]`

=`[(1(2)+3(3), 1(4)+3(2)), (-2(2)+5(3), -2(4)+5(2))]`

=`[(2+9, 4+6), (-4+15, -8+10)]`

=`[(11,10),(11,2)]`