anonymous
  • anonymous
Evaluate
Mathematics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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anonymous
  • anonymous
freckles
  • freckles
multiplying a 3 by 2 with a 2 by 3 will result in a 3 by 3 the inner numbers have to match then the dimensions of the product will be the exterior numbers there
anonymous
  • anonymous
wait, what do you mean 3 by 2 and 2 by 3?

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freckles
  • freckles
those are the dimensions of your matrices respectively
freckles
  • freckles
anyways to find the entries you do rows from the first matrix with columns of the second matrix
freckles
  • freckles
for example entry 1 will be 2(5)+0(0)
freckles
  • freckles
in general the first element in the product matrix would look like this \[\left[\begin{matrix}a_{11} & a_{12} \\ a_{21} & a_{22} \\ a_{31} & a_{32}\end{matrix}\right] \cdot \left[\begin{matrix}b_{11} & b_{12} & b_{13} \\ b_{21} & b_{22} & b_{23}\end{matrix}\right] \\ =\left[\begin{matrix}a_{11} \cdot b_{11}+a_{12} \cdot b_{21} & ? & ? \\ ? & ? & ? \\ ? & ? & ?\end{matrix}\right]\]
freckles
  • freckles
basically we did the dot product of and
freckles
  • freckles
to find the first entry that is
freckles
  • freckles
|dw:1438660253075:dw|
anonymous
  • anonymous
this is so confusing, omg.
dan815
  • dan815
lol
dan815
  • dan815
do u want a formula?
freckles
  • freckles
|dw:1438660316576:dw|
anonymous
  • anonymous
Oh, okay okay, I get it now! Thank you!
freckles
  • freckles
https://en.wikipedia.org/wiki/Matrix_multiplication just in case I don't really want to type it all out but wikepedia already did you can see they multiplied a 3 by 2 with a 2 by 3 here look under rectanglular matrices BA
Jhannybean
  • Jhannybean
Whats the formula @dan815 :)
freckles
  • freckles
already did a formula for a 3 by 2 with a 2 by 3 *
dan815
  • dan815
|dw:1438660749700:dw|

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