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Math Help - Domains

  1. #1
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    Domains

    1. 90x^2-4x^3

    2. 2x^2 + 16000/x

    3. 2*pie*r^2 + 2000/r

    I think the first is all but 0, not sure about rest, thanks.
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  2. #2
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    why can't you let x = 0 for the first? if x = 0, the expression = 0 ... that's ok, isn't it?

    can't use x = 0 for the second ... division by zero is a no-no, correct?

    so, what can r not be in the third?
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  3. #3
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    ok

    I would say r cannot be 0 in the 3rd as well.
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  4. #4
    Senior Member euclid2's Avatar
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    Quote Originally Posted by bakeit1 View Post
    I would say r cannot be 0 in the 3rd as well.
    Correct.
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