The expression is ”.
The change is
To subtract –300 means add 300.
(Product of two same signs is positive)
(Add: – 100 + 300 = 200)
The value of the expression is .
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5c517eaa924043b9000c02e331ae3920.png\")
”.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=02cd8a438408a1800e000e4c14829d61.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=263fd06bcc310f5253751ac6af18c140.png\")
(Product of two same signs is positive)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9647fd8452ac53fda5f1a52af4f746e8.png\")
(Add: – 100 + 300 = 200)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1b36e5c2c5129da1c5982c650e03400b.png\")
.