Finding Holes in Functions
Consider the following function:
![](http://i.imgur.com/PFcFCPX.png)
Let's first find any vertical asymptotes by setting the denominator equal to zero and getting the result:
x - 2 = 0
x = 2
It appears we have a vertical asymptotes at x = 2.
![](http://i.imgur.com/ISNg6Ae.png)
But what does the actual graph look like of the function?
![](http://i.imgur.com/UlPAmFk.png)
It appears it is roughly linear. How can that be? There doesn't appear to be an asymptote at x = 2...
What we have encountered is a hole in the equation, and it is a point where the function has no defined y value for a given x, yet the function appears continuous. This function is then defined as continuous and differentiable at all points except x = 2.