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Math4Life

  • 2 years ago

Math question!! :O Help!

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  1. Math4Life
    • 2 years ago
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    @TehAustin question from a practice quiz

  2. Math4Life
    • 2 years ago
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    Same one?

  3. Math4Life
    • 2 years ago
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    Oh lol well do you know how to do this kind of problem?

  4. Math4Life
    • 2 years ago
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    click the link

  5. Math4Life
    • 2 years ago
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    Ok@hartnn will you help me again?? lol sorry

  6. Math4Life
    • 2 years ago
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    @hartnn

  7. hartnn
    • 2 years ago
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    have u learned matrix multiplication ?

  8. Math4Life
    • 2 years ago
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    a little of it

  9. hartnn
    • 2 years ago
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    so can u multiply 2 matrices ??

  10. Math4Life
    • 2 years ago
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    matrices are my weakness as you can see :/

  11. hartnn
    • 2 years ago
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    i believe u have choices here too.....else this will be very lengthy problem to solve....

  12. Math4Life
    • 2 years ago
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    ok hold on

  13. hartnn
    • 2 years ago
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    1st element = 15

  14. Math4Life
    • 2 years ago
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    There

  15. Math4Life
    • 2 years ago
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    So the first answer?

  16. hartnn
    • 2 years ago
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    as u can see there is only 1 matrix with 1st element = 15 yes, first.

  17. Math4Life
    • 2 years ago
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    @hartnn Thanks your a lot of help :)

  18. hartnn
    • 2 years ago
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    nopes, i would be more happy if u would have understood the method...

  19. Math4Life
    • 2 years ago
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    explain it to me then

  20. hartnn
    • 2 years ago
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    |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 ??

  21. Math4Life
    • 2 years ago
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    Yes this makes a lot of sense @hartnn I appreciate you explaining it to me!

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