IB MATHEMATICS Topic : Matrices – 2 x 2 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