\
\
The difference is
\
(The product of two same signs is positive)
\
(Add:
)
\
The difference is
.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3fef93e9815aba2931fee1502bad5cb5.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b8e920884bc64074e933b9b83fc932cd.png\")
(The product of two same signs is positive) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9ef77688166cacc775544fd082a62ae2.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=eb8f5a6b832e091267631e9ae43590ba.png\")
)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=74f3d3e4c40071d7ac71e61153308410.png\")
.