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Thread: #28 problem from REA preparetion book

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    #28 problem from REA preparetion book

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    Please help me to answer

    In the integral domain D={r+s(17)^(1/2)} which of the following is irreducible?
    a 8+2(17)^(1/2)
    b 3-(17)^(1/2)
    c 9-2(17)^ (1/2) - this is answer, but I don't know why
    d 7+(17)^(1/2)
    e 13+(17)^(1/2)

    If someone have scanned REA book or know where I can dowland it, please sent it to me. There is no time to waite when books is arrival by post.

    Thanks

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    REA preparation book

    Which book is REA preparation book ?

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