Justify logarithmic functions will always have a restriction on the domain.
Consider the logarithm function .
The function does not have any vertical asymptote.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0c685b2663c2f33969c19888ed0bed92.png\")
.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")