An application of Pythagoras 's Theorem reduces this to saying that (a2 + b2) + 2ab and (a2 + b2) - 2ab are perfect squares.
Isang application ng Pythagoras' s teorama binabawasan na ito sa kasabihan na (a 2 + b 2) + 2 AB at (a 2 + b 2) - 2 AB ay perpekto squares.