Question

what should be taken away from x²-4y²+5xy+50 to obtain -x²-y²+6xy+20​​

Answer 1

Answer:

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Answer 2

-> x²-4y²+5xy+50 - A = -x²-y²+6xy+20

->A= -x²-y²+6xy+20-x²+4y²-5xy-50

->A= (-1-1)x²+(-1+4)y+(6-5)xy+20-50

->A= -2x²+3y²+1xy-30