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Math Help - Finding the Pre-Image

  1. #1
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    Question Finding the Pre-Image

    In f: Z--->N (where N represents natural numbers and Z represents integers.

    For the function f(x) = 2|x|, find the pre-image of the set {10, 11, 12, ... , 19}

    Would it be {-9, -8, -7, -6, -5, 5, 6, 7, 8, 9}?
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  2. #2
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    Re: Finding the Pre-Image

    Quote Originally Posted by cantuba View Post
    in f: Z--->n (where n represents natural numbers and z represents integers.

    For the function f(x) = 2|x|, find the pre-image of the set {10, 11, 12, ... , 19}

    would it be {-9, -8, -7, -6, -5, 5, 6, 7, 8, 9}?
    correct.
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