Reduction of matrix equation

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1. Dec 2, 2015

Martin V.

Hello hope you can help me.

Can anybody tell me what goes on from equation 3 to 4. especially how gets in?

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2. Dec 2, 2015

RUber

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.

3. Dec 2, 2015

Martin V.

That right - thank you!