A removable discontinuity is a point on the graph that is undefined or does not fit the rest of the graph. There are two ways a removable discontinuity is created. One way is by defining a blip in the function and the other way is by the function having a common factor in both the numerator and denominator.

How do you know if it's a removable discontinuity?

If the function factors and the bottom term cancels, the discontinuity at the x-value for which the denominator was zero is removable, so the graph has a hole in it. After canceling, it leaves you with x – 7. Therefore x + 3 = 0 (or x = –3) is a removable discontinuity — the graph has a hole, like you see in Figure a.

What are the 3 types of discontinuity?

There are three types of discontinuities: Removable, Jump and Infinite.