solve this middle term: x^3+6x^2y+11xy^2+ 6y^3
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f(x)=x^3–6x^2y+11xy^2–6y^3.
put x=y , f(y)= y^3–6y^3+11y^3–6y^3 =0,
Therefore (x-y) is a factor of f(x).
x^3–6x^2y+11xy^2–6y^3.
=x^2(x-y)+x^2y-6x^2y+11xy^2–6y^3.
=x^2(x-y)-5x^2y+11xy^2–6y^3.
=x^2(x-y)-5xy(x-y)-5xy^2+11xy^2–6y^3.
=x^2(x-y)-5xy(x-y)+6xy^2–6y^3.
=x^2(x-y)-5xy(x-y)+6y^2(x-y).
= (x-y)[x^2–5xy+6y^2].
=(x-y)[x^2–2xy-3xy+6y^2].
=(x-y)[x(x-2y)-3y(x-2y)].
=(x-y) (x-2y) (x-3y) . Proved.
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