anonymous
  • anonymous
Solve the matrix equation.
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
[-5, -13_0, 5]X=[3, 1_-4, 0] Sorry idk how to use the other equation sign thing :P
anonymous
  • anonymous
My teacher that when you multiply you have to do it from the left or you will get a different answer... My answer was X=[1.48, -.8_-.2, 0]
anonymous
  • anonymous
So it would be multipled [-.2, -0.52_0, 0.2] [3, -4,_1,0]

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anonymous
  • anonymous
is it alright if i multipled from the left instead of the right? that what my book and my teacher did, so i'm confused. idk which way is the right way... :(
anonymous
  • anonymous
You are correct. You have to multiply on the left to get the right answer. Matrix multiplication is not commutative, so the order of multiplication is really important.
asnaseer
  • asnaseer
yes greeneyes - you (and joemath) are right. you MUST multiply on the left or you will get the wrong answer. I believe across has the wrong answer here. e.g if: \[AX=B\]then:\[A^{-1}AX=A^{-1}B\]therefore:\[X=A^{-1}B\]
anonymous
  • anonymous
Thank you both so much! :)
asnaseer
  • asnaseer
yw

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