\
The expression is
.
\
(Product of two same signs is positive sign)
\
(Add:
)
\
\
The value is
.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5ff2c4dada1224b3b32f591342920b4a.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9a89f3848fcc18657e3eda9311c0b2c4.png\")
(Product of two same signs is positive sign) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=526ee310c600c3fc2f35d664d5c73f26.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=cc17e775624ae97d31b93e4b721a0a60.png\")
) ![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1e082a7e7f1e0ccd5c6aec8a6a3b892e.png\")
.