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:

The answer is a)-2(x² - y²)

Step-by-step explanation:

you can rearrange the terms to get

(y² -x²)-(x² - y²)

= y² -x²-x² + y²

= 2y² - 2x²

= -2(-y²+x²)

= -2(x² - y²)