anonymous
  • anonymous
Math question!! :O Help!
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
@TehAustin question from a practice quiz
anonymous
  • anonymous
Same one?
anonymous
  • anonymous
Oh lol well do you know how to do this kind of problem?

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anonymous
  • anonymous
click the link
anonymous
  • anonymous
Ok@hartnn will you help me again?? lol sorry
anonymous
  • anonymous
@hartnn
hartnn
  • hartnn
have u learned matrix multiplication ?
anonymous
  • anonymous
a little of it
hartnn
  • hartnn
so can u multiply 2 matrices ??
anonymous
  • anonymous
matrices are my weakness as you can see :/
hartnn
  • hartnn
i believe u have choices here too.....else this will be very lengthy problem to solve....
anonymous
  • anonymous
ok hold on
hartnn
  • hartnn
1st element = 15
anonymous
  • anonymous
There
anonymous
  • anonymous
So the first answer?
hartnn
  • hartnn
as u can see there is only 1 matrix with 1st element = 15 yes, first.
anonymous
  • anonymous
@hartnn Thanks your a lot of help :)
hartnn
  • hartnn
nopes, i would be more happy if u would have understood the method...
anonymous
  • anonymous
explain it to me then
hartnn
  • hartnn
|dw:1347303006293:dw| matrix multiplication is performed as : for 1st element u multiply corresponding elements of 1st row of 1st matrix and 1st column of 2nd matrix and then adding all of them., as shown. so u had BA right ? first row of B was 3,6,3 first column of A was -1,2,2 multiplying and adding, we get : 3*(-1)+6*2+3*2 = 15 thats how i got 15... does this make some sense to u ??
anonymous
  • anonymous
Yes this makes a lot of sense @hartnn I appreciate you explaining it to me!

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