The expression is .
Find the product of sum and difference.
(Product of sum and difference)
(Substitute and )
(Substitute )
. \ \
.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3161f5e6a42181aef8f3e092b61088a8.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a6a63a641a37159cd4810c3741f94350.png\")
(Product of sum and difference)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=120b9c7ffbe5da6b137d4859a5c5b872.png\")
(Substitute ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5fb0333b4ce6495334cbc2a477961c36.png\")
and ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2b827825eafb61e33f7d6d3c882dc09c.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a10109fd797a9a5155fc32ea83a49c61.png\")
(Substitute ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3db938fb86e2aab28aabef956ddb88e2.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ef7c0d1ee30d1c7e8b882a4ac7928de0.png\")
. \ \
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ef7c0d1ee30d1c7e8b882a4ac7928de0.png\")
.