2 x 2 Matrices – Sums, Products Determinants and Inverses

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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

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