The definition of difference of the two functions is .
(Simplify)
(Substitute x for 4)
The value of the function is .
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2b8cf5ee92303f5c5032b2dbaaf261fd.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5402d9b414b7271dcf97e838e9b2676c.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=76a77f43b5710954f8b010f174c57e50.png\")
(Simplify)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=bdcf948f0d1a60c40a24ca4ad753c568.png\")
(Substitute x for 4)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0e14529e9b6301fbf71c88f163664a1d.png\")
(Simplify)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9a57928a85e544498a1a6fc34dcb28e2.png\")
.