The standard form of complex number is and its conjugate .
The complex number is and its conjugate and their multiplication is
Substitute the value .
.
The solution is 20.
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and its conjugate ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a834beb91ba970760c984597791b7b77.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=dff501a3a021f8cd2b7edb527e1c7916.png\")
and its conjugate ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c8c8bd49c224cba998f1f4f8f843d465.png\")
and their multiplication is![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1fc0396204de46018bd5f76999f59e99.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=12680bfd22a260881b00191700663fb1.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=899b486086efe0f1133cb48c2e9a1d3c.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=cf3bd74905ce72ea9a2eca4c6e8b84a0.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f6f1af2512bfbd88ee0f43d7e8abe864.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9869fc514f4401cef84d1ff68f6b8ce7.png\")
.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")