37
y and
z are completely interchangeable and so their
(In the original equations,
y 2 z 2 -2yz through the
values can be swapped: I only took one factorisation of
z-yሻ 2 works in exactly the same way) If xൌ1, yൌ2009, zൌ2008 or yൌ2008, zൌ2009
extrapolation, although (
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Division by 15 If the number can be evenly divided by 3 and 5, the same can also be said for 15. Use the methods for Division by 3 and Division by 5 above. If they both work, your number is also evenly divisible by 15.
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