The function is .
Molly is correct, since she was substituted 2a for x in the original function.
Substitute the value of in the original function.
.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0ceb1e251d44b89e83f0b170149db951.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=10417faf57f5c458e90dedbd2e7533bb.png\")
in the original function.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=017d4b5f7e59cf7fca2080f21b22c15c.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=86af599705b3843a663093e59a7b1675.png\")
.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")