The expression is .
(Factor each term)
Take out greatest common factor (GCF) = 3
(Difference of two squares:
.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
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.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c8698d0b736fdc23baf627f1df866653.png\")
(Factor each term)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=03f333f3e7d8f2bc97077211141c4700.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=dc5443fe85a1934064387eaa034d059e.png\")
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(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\")
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.