# I have this function: f(x) = (x + 5)/(x^3 − 9x) I think I am told the domain is {+-3,0} But why does the domain not also include -5?

Question

I have this function:

f(x) = (x + 5)/(x^3 − 9x)

I think I am told the domain is

{+-3,0}

But why does the domain not also include -5?

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