Question

Add :

$x {}^{2} - y {}^{2} - 1 \: \: \: \: \: \: x {}^{2} - y {}^{2} - 1$

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Answer 1

Answer:

{x}^{2} - {y}^{2} - 1 {y}^{2} - 1 - {x}^{2} - {y}^{2} = {x}^{2} - {y}^{2} - 1 + {y}^{2} - 1 - {x}^{2} + 1 - {x}^{2} - {y}^{2} = > {x}^{2} - {x}^{2} - {x}^{2} - {y}^{2} + {y}^{2} + {y}^{2} - {y}^{2} - 1 - 1 + 1 = > (1 - 1 - 1) {x}^{2} + ( - 1 + 1 - 1) {y}^{2} - 1 - 1 + 1 = { - x}^{2} - {y}^{2} - 1.x

2

−y

2

−1y

2

−1−x

2

−y

2

=x

2

−y

2

−1+y

2

−1−x

2

+1−x

2

−y

2

=>x

2

−x

2

−x

2

−y

2

+y

2

+y

2

−y

2

−1−1+1=>(1−1−1)x

2

+(−1+1−1)y

2

−1−1+1=−x

2

−y

2

−1.

Answer 2

Answer:

This the answer

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