On multiplying B withA , the elements of A get multiplied by 1(multiplication of B is done by each rows of A) thus there is no effect on the elements of A but the final result get changed completely as before multiplication A was 3×3 matrix but after multiplication its a 3×1 column matrix.
b).Now we have to multiply transpose of B i.e Bt to left of A ,thus
Clearly, as part (a) ,the elements of A get multiplied by 1(in fact this time multiplication is done by each column of A by B) and the finally A becomes a 1×3 row matrix.
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