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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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