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Let A = {2,6,8} and B = {5,6}. Find B*A

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1 Answer

I assume your are talking about matrix multiplication with the symbol "*".

A is a 1x3 matrix, and B is a 1x2 matrix. In order to multiply, B needs to be a 2x1 matrix. So I assume that you mean BT = {5,6} so that this multiplication will work, where BT is the transpose of the matrix B.

B*A is a 2x3 matrix =  ⌈10 30 40⌉
                                 ⌊12 36 48⌋

where {B*A}ij = Bi*Aj