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Question
Question 2 (x)
Add:
x2−y2−1, y2−1−x2, 1−x2−y2
Question 2 (x)
Add:
x2−y2−1, y2−1−x2, 1−x2−y2
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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
=(1−1−1)x2+(−1+1−1)y2−1−1+1
=−x2−y2−1
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
=(1−1−1)x2+(−1+1−1)y2−1−1+1
=−x2−y2−1
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