2x2 Matrices - Sums, Products, Determinants and Inverses

Adding Matrices

Matrices add in the natural way:

Example:

Multiplying Matrices

Multiplying is a little more complex. Remember that you multiply rows by columns.

Example:

Determinants of Matrices

To find the determinant of a matrix multiply diagonal corners together and subtract.

Example:

Inverses of Matrices

Each entry in the matrix can be divided byin the natural way. An example is shown below