Question

Subtract 1 + x2 + y2 from the sum of x2 – y2 and 1- x2 –y2.

Answer 1

Answer:

x² + 3y²

Step-by-step explanation:

1 + x² + y² - (x² - y² + 1 - x² - y²)

=> 1 + x² + y² - (- y² + 1 - y²)

=> 1 + x² + y² - (- 2y² + 1)

=> 1 + x² + y² + 2y² - 1

=> 1 + x² + 3y² - 1

=> x² + 3y²