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Math Help - interval notation

  1. #1
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    Post interval notation

    Helpwith finding the domain of
    f(x)=7-squar3x+21, and express it using interval notation.
    my answer is (-7,infinity). thanks for taking time to check this question.
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  2. #2
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    Quote Originally Posted by wayne View Post
    Helpwith finding the domain of
    f(x)=7-squar3x+21, and express it using interval notation.
    my answer is (-7,infinity). thanks for taking time to check this question.
    Hello,

    if your notation means that the (-7) belongs to the domain too, then your answer is correct.

    I'm used to a slightly different notation and I would write it like this: [-7; ∞[ Because ∞ is not a real number the infinity doesn't belong to the domain.
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  3. #3
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    Smile thats right

    thanks, needed another person to look at it also. but yes you are right. thank you very much.
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by wayne View Post
    needed another person to look at it also.
    i'm used to seeing the notation

    [-7 , ∞)

    we use square brackets to show inclusion and parentheses to show exclusion
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