\
The expression is
.
\
The product two
same signs is positive.
\
\
\
The value of expression is
.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7a5060629d54663cf85dd3e2a5776db9.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=21ccde1003ee38fd260099bcf945efe5.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e32ed0bcbefb0f867cd204c2832b635c.png\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=81b9f7fc68aeb5699aeb10cc0d5738e2.png\")
.