Question 1207460
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<pre>

Step 1.  Multiply (a+bi) by (c+di);  then take the bar over this product.

         it will be (z* w) bar.



Step 2.  Take bars first, transforming  a+bi  to  a-bi
                          and           c+di  to  c-di.

         Now multiply  (a-bi)  by  (c-di).

         It will be z bar * w bar.



Step 3.  Now compare your results in steps 1 and 2.

         If you calculated everything correct, you must get identical results,
         which will prove your statement.

         It you will get different results,  then check and re-check, double check and cross-check,
         until you find and correct all possible mistakes.
</pre>


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On complex numbers, &nbsp;see introductory lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/complex/Complex-numbers-and-arithmetical-operations.lesson>Complex numbers and arithmetical operations on them</A>

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/complex/Complex-plane.lesson>Complex plane</A>

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/complex/Addition-and-subtraction-of-complex-numbers-in-complex-plane.lesson>Addition and subtraction of complex numbers in complex plane</A>

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/complex/Multiplication-and-division-of-complex-numbers-in-complex-plane-.lesson>Multiplication and division of complex numbers in complex plane</A>

in this site.