Question

what should be taken away from 3x²-4y²+5xy+20 to get -x²-y²+6xy+20​

Answer 1

Answer:

$4x^{2} - 3y^{2} -xy$

Explanation:

$(3x^{2} -4y^{2} + 5xy + 20) -(-x^{2}-y^{2} + 6xy + 20 )\\4x^{2} - 3y^{2} -xy$