Need algebra help with mutiplication of matrices: Basic

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Nov 20th, 2015

Thank you for the opportunity to help you with your question!

In matrix multiplication , no of rows in first matrix should be equal to no of rows in the second matrix, so in this case, matrix A has 3 rows and matrix B has 3 colomuns, so matrix multiplication is possible


AB=[    6 x-7     -3x 4    -1 x6     ]

       [      1 x0      2 x7       7 x3   ]

    =[   -42       -12    -6       ]

       [.      0.      14.    21.   ]      answer      

Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 20th, 2015

so the answer is:  0, 14, 21

Nov 20th, 2015

The answer is...


-42.   -12.    -6

0.      14.      21.      This is the matrix. It has got 2 row and 3 colomuns. You can put the bracket sign.
This full matrix is the answer.


Nov 20th, 2015

The answer is...


-42.   -12.    -6

0.      14.      21.      This is the matrix. It has got 2 row and 3 colomuns. You can put the bracket sign.
This full matrix is the answer.


Nov 20th, 2015

This matrix got 6 elements, 2rows and 3 colomuns, I think now you understand the answer. You can put the bracket sign outside the matrix yourself, in my iPad I can't do, thanks 

 

   


Nov 20th, 2015

This matrix got 6 elements, 2rows and 3 colomuns, I think now you understand the answer. You can put the bracket sign outside the matrix yourself, in my iPad I can't do, thanks 

 

   


Nov 20th, 2015

Ok I am being told that your answer is incorrect

Nov 20th, 2015

Ok, I will try again, give me some time

Nov 20th, 2015

A B=[ 6x-7+1x0         6x4+1x7      6x6+1x3]

       [ -3x-7+2x0.        -3x4+2x7.     -3x6+2x3]

        [-1x-7+7x0.          -1x4+7x7.      -1x6+7x3]

AB=[ -42.    24+7.    36+3 ]

        [ 21.    -12+14.   -18+6]

         [ 7.       -4+49.     -6+21]

AB= [. -42.     31.   39]          

         [ 21.       2.     -12]  

         [  7        45      15]

So AB matrix has 3 rows and 3 colomuns and 9 elements , pl put the exact bracket sign and this is the answer.

Sorry for inconvenience

Nov 20th, 2015

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