Question

Please solve this one please​

Answer 1

Answer:

-x²-y²-1

Step-by-step explanation:

(x²-y²-1)+(y²-1-x²)+(1-x²-y²)

= x²-y²-1+y²-1-x²+1-x²-y²

Let's arrange them:

(x²-x²-x²)+(-y²+y²-y²)+(-1+-1+1)

=(-x²)+(-y²)+(-1)

= -x²-y²-1

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