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_v3QS0S1-JQzAARvYnWlVU2TzcpmqpgeKuJ_Jmk2RkItSRBmXfvZaRJDDgd1IY5SQAs5fiFdgAd2mzhHIbPK5coTpDDGREtAxbtHrJRLJBVc5rs1NY0szo=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_ujaJPfYlL4zNj4tCT5lfvNhQoNBg59_e9ZyMubz26KoN6W0VBoAsHi1HK-UfowOsy81aSr_Y71a0cr_n-PG2RqY0I1v5q0bNBIouhU_44mJGsIvGDxLA=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_vsj0n0IgakEBSfV_j2PgmR-kylzPTqAfqc-_-uY08auGgsMJIUDmvx6LSCk_chfh59-7pcXH4d_wPK8btUs15uC5Cj5hIAjcEMjSQoerSLjQokCCsAevU=s0-d){kind=small}
A – C is not defined, because A and C are not the same size.
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