The expression is .
(Product of two different signs is negative)
(Subtract: )
The sum of the expression is 9.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=bd4152284c69e5e20ae4bad3c923c70d.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=543e9990d83634434a4e10e33f9d98ec.png\")
(Product of two different signs is negative)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d74d4ec5771319368d70f0f70ff65471.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ffd8b869abdf9c94a5165d5e960648bf.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")