Question

adding x²-y²-1,y²-1-x² and 1-x²-y²​

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

= -x² - y² - 1

Answer 2

HOPE IT WILL HELP YOU.....