math

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hello,
i have some question about rational functions.
1) are there any sites that are good in teaching graphing rational functions?

2) for the domain of the rational function it is what the denominator cannot equal to rite? for example the denominator of x^2-7x+10 can be factored to (x-2)(x-5) so the domain whould be X cannot equal to +2,+5 rite. these are also the Vertical asymptotes rite?

and last questions how would you expand x^3-9
thanks

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