anonymous
  • anonymous
Anyone know of a good way to find the answer to det[x+5 4 4],[-4 x-3 -4], [-4 -4 x-3] = 0
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
Read this, be happy: http://en.wikipedia.org/wiki/Rule_of_Sarrus
anonymous
  • anonymous
It involves a bit of algebra and keeping track of your terms, but it's a quick and easy way to compute the determinant without a whole lot of hassle.
anonymous
  • anonymous
ok thanks, I kind of knew that rule, but I was wondering if there was something I was missing, something that would make it easier, but perhaps it's as easy as it will get, it's just the x's complicate things

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anonymous
  • anonymous
Yeah, no computation of the determinant of a 3x3 matrix with variables will ever be easy. :/ Sorry, it's just one minor tedious thing that eventually, you can leave to a calculator. xD
anonymous
  • anonymous
ahh k thanks a lot for your help
anonymous
  • anonymous
If not you should get x1 = 3 and x2 = -1 if I haven't miscalculated.

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