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I know what the answer is just not how to exopress it. Can someone help me please?

State the domain of the function:


Now I know the domain is
(-infinity,3) U (3, infinity)?

(-infinity,3] U [3, infinity) ?
How do I express it? do I use ] brackets or open at the infinity and closed by the 3? i know x doesn't equal 3 so how do I show this in the answer? Thank you!

  • Algebra -

    If you close at 3, then you are including 3, which will create division by zero in this case.

    The variable x cannot be 3 for this rational function.

    I'd say write it like this:

    (-infinity,3) U (3, infinity)

    The above interval notation is saying that x < 3 or x > 3.

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