Question

from the sum of x²-y²-1,y²-x²-1 and 1-x²-y² subtract -(1+y²)​

Answer 1

Answer:

$- {x}^{2}$

Step-by-step explanation:

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

Adding these two gives

$- 2$

as answer

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

Adding these two gives

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

as answer

$- {x}^{2} - {y}^{2} - 1 \\ + 0 {x}^{2} - {y}^{2} - 1$

Subtracting these two gives

$- {x}^{2} + 0 {y}^{2} + 0$

as answer

Answer 2

Step by step explanation:

$= x^{2} - y ^{2} - 1 \\ = - x {}^{2} + y {}^{2} - 1 \\ = - 2 \\ = 1 - x {}^{2} - y {}^{2} - 2 \\ = - x {}^{2} - y {}^{2} - 1 \\ = - x {}^{2} + y {}^{2} - 1 + 0x {}^{2} - y {}^{2} - 1 \\ = - x {}^{2} + 0y {}^{2} + 0 \\ = - x {}^{2}$

the above is the full answer

answer is = -x^2