Question

what should be subtracted from x² - 5xy ± 4y² to get (-x² - y²)​

Answer 1

Answer:

-2x²-5y²+5xy (I am not sure)

Step-by-step explanation:

-x²-y²-(x²+4y²-5xy)

-x²-y²

-x²-4y²+5xy

———————

-2x²-5y²+5xy