Geometry_Hater
  • Geometry_Hater
Peform the following matrix multiplicattions without using a calculator [18 -4] [6 -1] X [2] [1/2 2] [3]
Mathematics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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anonymous
  • anonymous
Do you know how to do matrix multiplication?
Geometry_Hater
  • Geometry_Hater
No how do i multiply 18 times 2 ?
anonymous
  • anonymous
Since you are multiplying a 3x2 matrix by a 2x1 matrix the resultant matrix will be 3x1. To multiply you take element of the first row and multiply it by the corresponding element in the first column (of the other matrix). Then repeat his. This gives you \[[18*2+(-4)*3]\]\[[6*2+(-1)*3]\]\[[(1/2)*2+2*3]\] Which gives \[[24]\] \[[9]\] \[[7]\]

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anonymous
  • anonymous
You can learn more here: http://www.khanacademy.org/video/matrix-multiplication--part-1?playlist=Linear%20Algebra
Geometry_Hater
  • Geometry_Hater
ahh ha!!..... i get it now
anonymous
  • anonymous
I forgot these types of problems, but don't you use something like the distributive prop?

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