Matrices help

[Deathsnova]

Hey guys, i'm having some trouble with this. I just cant figure out what to do!

 

[kmjt]

a)

To be able to add two matrices, they must be of the same size. If they are not the same size (if they do not have the same "dimensions"), then the addition is "not defined" (doesn't make mathematical sense).

A+B = YES
B+C = NO
C+A = NO
A+D = YES



b)

The number of columns of the 1st matrix must equal the number of rows of the 2nd matrix. The result will have the same number of rows as the 1st matrix, and the same number of columns as the 2nd matrix.

AC = YES
CA = YES
CD = YES
AB = NO

 

[Deathsnova]

a)


A+B = YES
B+C = NO
C+A = NO
A+D = YES



b)


AC = YES
CA = YES
CD = YES
AB = NO

Thank you for your help.

 

a)


A+B = YES
B+C = NO
C+A = NO
A+D = YES



b)


AC = YES
CA = YES
CD = YES
AB = NO

Thanks for helping him KMJT. LU coming up huge in math bud.