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Reduction of matrix equation

  1. Dec 2, 2015 #1
    Hello hope you can help me.

    Can anybody tell me what goes on from equation 3 to 4. especially how upload_2015-12-2_16-4-12.png gets in?

    mdsd.jpg
     

    Attached Files:

  2. jcsd
  3. Dec 2, 2015 #2

    RUber

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    Homework Helper

    Note that ##\overline{Y}(n \overline{X}^2 ) = \overline{X}(n \overline{X}\overline{Y}).## This means that from 3 to 4, there was an addition of zero...likely to make the step from 4 to 5 more clear.
     
  4. Dec 2, 2015 #3
    That right - thank you!
     
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