Greatest Common Divisor in a strange extension ring.

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Homework Statement


I need to show that two elements in [tex]\textbf{Z}[/tex][[tex]\sqrt{-5}[/tex]] have gcd = 1.
The elements are 3 and 2+[tex]\sqrt{-5}[/tex]


Homework Equations





The Attempt at a Solution


My way of thinking was if I can show that both elements are irreducible, then they are both prime and hence have gcd of 1. I can show they are both irreducible, using the norm function - ie showing that if eg 3 = ab then either N(a) or N(b) is 1. This means that 3 is irreducible in this ring. I think.
Can somebody tell me if this is correct please? Like I said, I'm almost there, just need to polish it off!
Thanks in advance.
 

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