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Math Help - decimal expansion

  1. #1
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    decimal expansion

    Suppose that a element J has decimal expansion 17:3491400238:::, so that f(a) = 4.
    Can you name  delta > 0 such that /f(x)f(a)/ < 1 for all x element J such that /x-a/ < delta ? the answer for delta is 1/10^8 but dont know how to prove it?
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  2. #2
    Grand Panjandrum
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    Re: decimal expansion

    Quote Originally Posted by sbacon1991 View Post
    Suppose that a element J has decimal expansion 17:3491400238:::, so that f(a) = 4.
    Can you name delta > 0 such that /f(x)f(a)/ < 1 for all x element J such that /x-a/ < delta ? the answer for delta is 1/10^8 but dont know how to prove it?
    Is that the complete question as worded in the book/sheet? Some context might also help.

    CB
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