![\"\"](\"http://c4anything.com/userfiles/image/steps_images/step1.JPG\")
\
For subtracting matrices, their dimension should be equal.
\First write the dimension of the matrix.
\The dimensions of matrix B and C are ![\"\"](\"http://c4anything.com/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=005d206c92b8d7c609a15bd3eef2db91.png\")
.
The dimensions of matrix D and C are ![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c78e629e4f213abf98823980a4b44032.png\")
.
![\"\"](\"http://c4anything.com/userfiles/image/steps_images/step2.JPG\")
The operation B + 2C is possible.
\The operation (B + 2C) + D is not possible,
\since the dimensions are not equal.
\![\"\"](\"http://c4anything.com/userfiles/image/steps_images/solution.JPG\")
The operation of (B + 2C) + D is impossible
\