Scalar Multiplication states that:
If matrix A = [aij] and c is a scalar, then cA = [caij].
you can use a combination of addition and scalar. for example
solving a matrix m x n A-B.
A-B is just the same as A+(-B). you just do this by multiplying -1 to matrix B.
you can just do this if both matrix is the size m x n
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