I get 3x^3-9x^2y-3xy^2-3xy^2+y^3 =3x^3-9x^2y-6xy^4+y^3 :( please help....thanks
3x³ + 9x²y - 3xy²
____- x²y - 3xy² + y³
3x³ + 8x²y - 6xy² + y³
(3x-y)(x²+3xy-y²)
=3x(x²+3xy-y²)-y(x²+3xy-y²)
=3x^3+9x²y-3xy²-x²y-3xy²+y^3
=3x^3+8x²y-6xy²+y^3
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Verified answer
3x³ + 9x²y - 3xy²
____- x²y - 3xy² + y³
3x³ + 8x²y - 6xy² + y³
(3x-y)(x²+3xy-y²)
=3x(x²+3xy-y²)-y(x²+3xy-y²)
=3x^3+9x²y-3xy²-x²y-3xy²+y^3
=3x^3+8x²y-6xy²+y^3