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 ]]](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_tlBH3AJpqs2f-8mx8vvV2lkRaiCxYqFnC9GQ0EOCWwtV8Li16T2ZcdaZxPf3S9vxpP0tnK9rxkkNHViICtJj4yAYUf_6h7b1uztK9lD4dcqMV7XpkU-RE=s0-d){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]]](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_t97_JTMUZjpRHGuxr2Iy6PZK3Y8WenWV2eeWwgUkfAM5-VrfEET_cIUsWdu5hK5vDpwi7JXJKMIimCtgCjGPQ9FRje48d5FMCg2qlNELujwXpKKmkK1A=s0-d)
- 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]]](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_vhyQtJwz_ektg8O5hftIdjhlKYA98pFYQjVL9rbTOKWMvde-c81WgOMoVflVHCep7GrxumEpW9Fc1td9XqSwZMl9jcyzyFgwDBf3AICRIYJyeS1B-esZ4=s0-d){kind=small}
A – C is not defined, because A and C are not the same size.
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