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# Function graph help watch

1. If I have a function definied and continous in the open interval (a,b) and I know how it behaves in this interval, but I don't know what happens outside it, since a and b are not part of its domain, when I draw the graph do I need to include the points (a,f(a)) and (b,f(b))?
2. (Original post by Noemiluisa)
If I have a function definied and continous in the open interval (a,b) and I know how it behaves in this interval, but I don't know what happens outside it, since a and b are not part of its domain, when I draw the graph do I need to include the points (a,f(a)) and (b,f(b))?
There is a conventional way of marking end points which are not included. Usually by a small open circle such as o.
3. (Original post by brianeverit)
There is a conventional way of marking end points which are not included. Usually by a small open circle such as o.
Thanks

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