\
The expression is
.
\
Rewrite the expression is
.
\
\
(Difference of two squares:
\
The solution is
.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=031db89853de39abed1afcb7b0cb62d3.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=cb6da97eff4df4337a08cbd4320ad1ba.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a798001909c5a6cd1b932b3ff7795b26.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=421f94a721c10660f9193d6466f39c12.png\")
(Difference of two squares: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e2699a979fb3b6dd25062d7967f349a9.png\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0022ebd0e39a1141374da4f5451967b0.png\")
.