Math4Life
Math question!! :O Help!
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Math4Life
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@TehAustin question from a practice quiz
Math4Life
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Same one?
Math4Life
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Oh lol well do you know how to do this kind of problem?
Math4Life
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click the link
Math4Life
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Ok@hartnn will you help me again?? lol sorry
Math4Life
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@hartnn
hartnn
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have u learned matrix multiplication ?
Math4Life
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a little of it
hartnn
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so can u multiply 2 matrices ??
Math4Life
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matrices are my weakness as you can see :/
hartnn
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i believe u have choices here too.....else this will be very lengthy problem to solve....
Math4Life
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ok hold on
hartnn
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1st element = 15
Math4Life
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There
Math4Life
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So the first answer?
hartnn
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as u can see there is only 1 matrix with 1st element = 15
yes, first.
Math4Life
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@hartnn Thanks your a lot of help :)
hartnn
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nopes, i would be more happy if u would have understood the method...
Math4Life
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explain it to me then
hartnn
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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 ??
Math4Life
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Yes this makes a lot of sense @hartnn I appreciate you explaining it to me!