I have started studying precalculus and would then start up with calculus. While studying about functions I wondered whether this function would be defined at a or not. Take a look at it. f(x)=(x−a)(x−b)(x−c)...(x−n)(x−a)
Here if we will simplify it further then the term (x−a) would cancel out making the function defined at a but if we would leave it as such it would be undefined at that point.
I asked this question because I found in some sources that the graph of such functions have an open dot at that point indicating it discontinuous at that point. But I couldn't explain it. Are the expressions before and after cancelling different or it's something else?
I would be highly obliged for your help and thanks ...
Answer
Consider the following functions: f(x)=5
g(x)=5(x−2)(x−2)
The function g is not defined at x=2, but agrees with f at every other point.
So we would say these functions are not the same, because their domains are different.
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