## Math4Life 3 years ago Math question!! :O Help!

1. Math4Life

@TehAustin question from a practice quiz

2. Math4Life

Same one?

3. Math4Life

Oh lol well do you know how to do this kind of problem?

4. Math4Life

5. Math4Life

Ok@hartnn will you help me again?? lol sorry

6. Math4Life

@hartnn

7. hartnn

have u learned matrix multiplication ?

8. Math4Life

a little of it

9. hartnn

so can u multiply 2 matrices ??

10. Math4Life

matrices are my weakness as you can see :/

11. hartnn

i believe u have choices here too.....else this will be very lengthy problem to solve....

12. Math4Life

ok hold on

13. hartnn

1st element = 15

14. Math4Life

There

15. Math4Life

16. hartnn

as u can see there is only 1 matrix with 1st element = 15 yes, first.

17. Math4Life

@hartnn Thanks your a lot of help :)

18. hartnn

nopes, i would be more happy if u would have understood the method...

19. Math4Life

explain it to me then

20. 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 ??

21. Math4Life

Yes this makes a lot of sense @hartnn I appreciate you explaining it to me!