subtract 11x2–3xy2–4xy from the sum of 2xy –13xy2+2x*2y+2x2y–4xy+ 9x2y–3xy2
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11x²-3xy²-4xy
2xy-13xy²+4xy+4xy-4xy+9x²y-3xy²
=2xy-10xy²+8xy-4xy+9x²y
=-2xy+8xy-10xy²+9x²y
=6xy-10xy²+9x²y
Now 11x²-3xy²-4xy-(6xy-10xy²+9x²y)
11x²-3xy²-4xy-6xy+10xy²-9x²y
=11x²+7xy²-10xy-9x²y
2xy-13xy²+4xy+4xy-4xy+9x²y-3xy²
=2xy-10xy²+8xy-4xy+9x²y
=-2xy+8xy-10xy²+9x²y
=6xy-10xy²+9x²y
Now 11x²-3xy²-4xy-(6xy-10xy²+9x²y)
11x²-3xy²-4xy-6xy+10xy²-9x²y
=11x²+7xy²-10xy-9x²y
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