The question is .
(Substitute )
(Product of two same signs is posititve)
(Add: )
The value of expression is .
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9fae09af4cb9cc26381c2e21dc7eef16.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=446e2c67ad45b780127d9978fd652d3f.png\")
(Substitute ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9b847f94aa3603c21a13bd0ec0299113.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3b8310d4ab63cb4f55492e66e91530c0.png\")
(Product of two same signs is posititve)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e02e7fc8160adb79291f743f8421f087.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=47412dd561bf5a838c322445b7564d87.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=59f91c7ff3d739672fb7044478562120.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f27f8fc9428bb41131be90a25905eb1b.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ea20246c69ace34fe72add6a120663f1.png\")
.