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anonymous
 one year ago
What is the determinant of
https://lincolnlearningsolutions.brainhoney.com/Resource/19809088,B84/Assets/assessmentimages/alg%202%20pt%202%20u3l5%2019.jpg
a)434
b)558
c)434
d)558
anonymous
 one year ago
What is the determinant of https://lincolnlearningsolutions.brainhoney.com/Resource/19809088,B84/Assets/assessmentimages/alg%202%20pt%202%20u3l5%2019.jpg a)434 b)558 c)434 d)558

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0You know how to solve determinants ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.03x3 determinants in particular I mean

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Okay, there's several ways to do this but for this case we'll go for the straight forward way of solving a 3x3 determinant.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I'd rather teach you the method instead of giving you the result like that because you'll likely have to deal with this some other time as well.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Given a 3x3 matrix, something like this dw:1435681448784:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The determinant of the matrix will be : a1 * a5 * a9 + a4 * a8 * a3 + a2 * a6 * a7  (a3 * a5 * a7 + a6 * a8 * a1 + a2 * a4 * a9)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Now this looks like a pain in the a** to memorize but there's a neat catch / trick to memorize this nicely

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1435681650081:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so wait, the only numbers that matter are the ones diagonally?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1435681769276:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0No no no  I'm trying to point out how you memorize these nicely but I wish I had colors to do so here.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0It's just like a phone pattern if you look at it.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yeah, I think it's best if you figure it out on your own, but that is the formula. Be very careful about the signs though.
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