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Question
Add: x2 - y2 - 1 , y2 - 1 - x2, 1- x2 - y2
Solution
(x2 - y2 - 1) + (y2 - 1 - x2) + (1 - x2 - y2)
= x2 - y2 - 1 + y2 - 1 - x2 + 1 - x2 - y2
= x2 - x2 - x2 − y2 + y2 - y2 - 1 - 1 + 1
= x2(1 - 1 - 1) + y2 (-1 + 1 - 1) + (- 1 - 1 + 1)
= -x2 - y2 - 1
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