EXAMPLES:
1.
2.
Given the following matrices, find A – Band A – C, or explain why you can not.
![A = [[ -1 2 0 ][ 0 3 6 ]] B = [[ 0 -4 3 ][ 9 -4 -3 ]] C = [[ 0 -4 ][ 9 -4 ]]](http://www.purplemath.com/modules/matrices/add05.gif){kind=small}
![A - B = [[ -1 2 0 ][ 0 3 6 ]] - [[ 0 -4 3 ][ 9 -4 -3 ]] = [[-1-0 2+4 0-3 ][ 0-9 3+4 6+3]]](http://www.purplemath.com/modules/matrices/add06.gif)
- A and C are not the same size, since A is 2 × 3 and C is 2 × 2. So this subtraction is not defined.
![A - B = [[-1 6 -3 ][-9 7 9]]](http://www.purplemath.com/modules/matrices/add07.gif){kind=small}
A – C is not defined, because A and C are not the same size.
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