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8x²-9xy
2x²+7xy
_________
10x²-7xy
10x²-7xy
-3y²-6xy
____________
10x²-3y²-13xy
=10x²-13xy-3y²
=10x²-15xy+2xy-3y²
=(5x+y)(2x-3y)
Resp: inciso b)