# Math Help - Multiplication of Matrices

1. ## Multiplication of Matrices

Assuming that R and A are two matrixes, for 5R-2A

you times matrix R by 5 and matrix A by 2, and then do the subtraction, right?

2. Originally Posted by brumby_3
Assuming that R and A are two matrixes, for 5R-2A

you times matrix R by 5 and matrix A by 2, and then do the subtraction, right?
Yes, but you should remember that both R and A should be of the same size. If R is $n \times n$, then A should also be $n \times n$, else subtraction wont be possible!