solve in positive integers:
a^2+5b^2=p^2
a^2-5b^2=q^2
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solve in positive integers:
a^2+5b^2=p^2
a^2-5b^2=q^2
Are we solving for a and b in terms of p and q,
p and q in terms of a and b,
or all possibilities for a,b,p and q?
Also:
2a2=p2+q2
10b2=p2-q2
find all quadriples (a,b,p,q)