3) Subtract 3x2 – 4y2 + 5xy + 20 from -x2 -y2 + 6xy + 20 ?
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=-x²-y²+6xy+20-(3x²-4y²+5xy+20)
=x²-y²+6xy+20-3x²+4y²-5xy-20
= -2x²+3y²+xy
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