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C4 vectors help!!

Im stuck on 7a and b with no idea how to do them
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Reply 1
You have + + = 13² you need to find out how many different number combinations make this true, with the numbers being a whole number(integer).
Reply 2
Is there any efficient way to do this or should I just trial and error?
you could reduce the options a bit by considering odd/even restrictions :dontknow:
https://en.m.wikipedia.org/wiki/Pythagorean_quadruple
Go to the parameterisation, start producing values for n,m,q

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