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Math Help - Need help Grade 11 math

  1. #1
    Newbie Oryon's Avatar
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    Post Need help Grade 11 math

    the domain of this quadratic relation in my math book is D= {X E R| 2 <_ x <_ 9} and the range is R = {y E R| 1 <_ y <_ 5} but I don't get what the E R means can someone please tell me.
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  2. #2
    o_O
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    D = \{x \in \mathbb{R} : 2 \leq x \leq 9\}

    Translation: The domain consists of all x in the set of real numbers such that x is greater than equal to 2 and less than or equal to 9.

    \in means 'belongs to'. \mathbb{R} refers to the set of all real numbers.
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