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