Question

Which matrix post multiplies (_1)
( 0) to get a matrix (5 4)
(0 0).​

Answer 1

Answer:

We can only multiply matrices if the number of columns in the first matrix is the same as the number of rows in the second matrix.

Example 1

a) Multiplying a 2 × 3 matrix by a 3 × 4 matrix is possible and it gives a 2 × 4 matrix as the answer.

b) Multiplying a 7 × 1 matrix by a 1 × 2 matrix is okay; it gives a 7 × 2 matrix

c) A 4 × 3 matrix times a 2 × 3 matrix is NOT possible

Answer 2

Answer:

We can only multiply matrices if the number of columns in the first matrix is the same as the number of rows in the second matrix.

Example 1

a) Multiplying a 2 x 3 matrix by a 3 x 4 matrix is possible and it gives a 2 x 4 matrix as the answer.

b) Multiplying a 7 × 1 matrix by a 1 x 2 matrix is okay; it gives a 7 x 2 matrix

c) A 4 x 3 matrix times a 2 x 3 matrix is NOT possible