O Level Additional Maths Notes: 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 by
in
the natural way. An example is shown below
