Question

what should be taken away from 3ײ - 4y ² + 5xy + 20 to obtain -x² - y²+ 6xy + 40 ​

Answer 1

Answer:

-x²-y²+6xy

3x²+x²-4y²+y²+5xy-6xy=a

4x²-3y²-xy=a.

hope it is helpful.