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=9x²-10x²+3xy+5xy-8y²+y²
=-x²+8xy-7y²
hasil jika difaktorkan
=-x²+8xy-7y²
=-7y²+8xy-x² ~ dikalikan (-)
menjadi:
=7y²-8xy+x²
=(7y-x)(y-x)
=9X2 - 10X2 + 3XY + 5XY - 8Y2 + Y2
=-X2 + 8XY - 9Y2