Removable Discontinuity: A removable discontinuity is a point on the graph that is undefined or does not fit the rest of the graph. There is a gap at that location when you are looking at the graph. When graphed, a removable discontinuity is marked by an open circle on the graph at the point where the graph is undefined or is a different value like this. In other words, a removable discontinuity is a point at which a graph is not connected but can be made connected by filling in a single point.
25.
f(x)=(x-3)/(x^2-9).........note: you can factor denominator
f(x)=(x-3)/((x-3)(x+3)).........now you can cancel (x-3).........since (x-3) is zero that we have removed, at x=3 functions will be continuous, but f is undefined
simplyfy
f(x)=1/(x+3)
