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Algebra II-Please check calcs

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Could someone check this matrix calculation
The first matrix dimension is 1 by 3
row 1 = 1
row 2 = 7
row 3 =3
Second matrix is 1 by 3
Row 1 column one =2
row 1 column two = -5
row one column three = 5
my calculation is that it would be the dimensions of 3 by 3
Final calcs would be row 1 column 1 = 2
row one-column two = -1
row one column three = 5
row two column 1 = 14
row two column two= -7
row two column three = 35
row three column one = 6
row three column two = -3
row three column three = 15

Is that correct?

  • Algebra II-Please check calcs -

    when you describe the first matrix as
    row 1 = 1
    row 2 = 7
    row 3 =3
    you are describing a column matrix with dimension 3 by 1 , not 1 by 3

    so I see you multiplying
    1
    7
    3
    by
    2 -5 5

    I got
    2 -5 5
    14 -35 35
    6 -15 15

    I am used to this notation :

    m by n matix has m rows and n columns
    Are you not using that same notation?

    anyway, you could not multiply a 1by3 by a 1by3, no matter what notation you are used to

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