Chapter 2 - Matrix Algebra - 2.4 Exercises - Page 123: 2

\[ MN= \left[ {\begin{array}{cc} EA+0C & BE+OD\\ OA+FC&OB+FD \end{array} } \right] \]

The product of \[ M= \left[ {\begin{array}{cc} E& O \\ O&F \end{array} } \right] \] and \[ N= \left[ {\begin{array}{cc} A&B\\ C&D \end{array} } \right] \] is \[ MN= \left[ {\begin{array}{cc} EA+0C & BE+OD\\ OA+FC&OB+FD \end{array} } \right] \]