Question

How do I find holes in graph? For example if the graph has a hole at x=2 and how would it look?

Answer 1

Holes are where the function is undefined.

Answer 2

When you come to the point of x=2, lets say y =2 and the equation is x=y.

Answer 3

@Abs.Zero, there should be no lines where the hole is.

Answer 4

Is there an eraser on there? :\ sorry I'm new here

Answer 5

Unfortunately not. :p

Here's a hole:
http://en.wikipedia.org/wiki/File:Discontinuity_removable.eps.png

Answer 6

it basically comes about from functions like this
\[\huge f(x)=\frac{(x-2)(x+1))}{x-2} \]

this function is defined everywhere except at x=2 but, the function curiously looks very much like the line y=x+1.....
ie, if there is a factor that can be cancelled from the top and bottom, that will give you a hole...

Answer 7

Thanks for your helps everyone!