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Math Help - matrix

  1. #1
    Faz
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    matrix

    suppose matrix product AB is defined

    Qa)if A is a 6x5 and B is a column matrix,give the dimensions of B and AB

    my ans: Dimension of B = 6x1 and Dimension of AB=6x1---plse assist to check

    Qb)If A is the identitiy matrix and B is a 6x6 , what size is A

    My ans: A is 6x6


    c)If A is 7x8 and B is the identity matrix, what is the size of B

    my ans: The size of B is 7x7

    Plse kindly check for me and help where possible.....
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by Faz View Post
    suppose matrix product AB is defined

    Qa)if A is a 6x5 and B is a column matrix,give the dimensions of B and AB

    my ans: Dimension of B = 6x1 and Dimension of AB=6x1---plse assist to check Your answer for the dimension of AB is correct. However, the dimension of B is only 5x1...

    Qb)If A is the identitiy matrix and B is a 6x6 , what size is A

    My ans: A is 6x6 Correct


    c)If A is 7x8 and B is the identity matrix, what is the size of B

    my ans: The size of B is 7x7 Correct

    Plse kindly check for me and help where possible.....
    .
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