Question

25. Find the sum of x² - y2-1, y2 - 2x”, x² +1.
please I request​

Answer 1

Answer:

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.

Answer 2

Step-by-step explanation:

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