Question

Which of the following is obtained by subtracting x²-y² from y² - x²? (A) -2(x²-y²) (B) -2(x²+y²) (C) 2(x²+ y²) (D) 2(x²- y²) *​

Answer 1

Answer:

Step-by-step explanation:

y² - x² - ( x² - y² )

= y² - x² - x² + y² ( ∵ - × + = - ; - × - = + )

= 2y² - 2x²

= - 2x² + 2y²

= - 2 ( x² - y² )

Option ( A ) is correct.