Answer:
Element wise subtraction.
Step-by-step explanation:
Matrix Subtraction is done element wise.
Therefore, D = [tex]\[ \left[ {\begin{array}{ccc} 3 & 1 & 0 \\ -1 & 2 & 4 \\9 & 7 & -2 \end{array} } \right]\][/tex] - [tex]\[ \left[ {\begin{array}{ccc} 5 & 2 & -4\\ 1 & 12 & 3 \\ 11 & 3 & -2 \end{array} } \right]\][/tex]
This becomes:
[tex]\[ D = \left[ {\begin{array}{ccc} -2 & -1 & 4 \\ -2 & -10 & 1 \\ -2 & 4 & 0 \end{array} } \right]\][/tex]
Now, [tex]$ d_{11} = -2 $[/tex]
[tex]$ d_{12} = -1 $[/tex]
[tex]$ d_{13} = 4 $[/tex]
[tex]$ d_{21} = -2 $[/tex]
[tex]$ d_{22} = -10 $[/tex]
[tex]$ d_{31} = -2 $[/tex]
