anonymous
  • anonymous
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
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
You know how to solve determinants ?
anonymous
  • anonymous
not at all
anonymous
  • anonymous
3x3 determinants in particular I mean

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anonymous
  • anonymous
Okay, 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
  • anonymous
I'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
  • anonymous
okay
anonymous
  • anonymous
Given a 3x3 matrix, something like this |dw:1435681448784:dw|
anonymous
  • anonymous
The 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
  • anonymous
Now this looks like a pain in the a** to memorize but there's a neat catch / trick to memorize this nicely
anonymous
  • anonymous
okay lol
anonymous
  • anonymous
|dw:1435681650081:dw|
anonymous
  • anonymous
so wait, the only numbers that matter are the ones diagonally?
anonymous
  • anonymous
|dw:1435681769276:dw|
anonymous
  • anonymous
No no no - I'm trying to point out how you memorize these nicely but I wish I had colors to do so here.
anonymous
  • anonymous
It's just like a phone pattern if you look at it.
anonymous
  • anonymous
ohhh okay
anonymous
  • anonymous
Yeah, 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.
anonymous
  • anonymous
okay. Thank you

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