3xy^2+6x^2y^2+9x^2
=3xy^2+6xx+9xx
=3xy^2+2.3xx+3.3xx
=3x(y^2+2xy^2+3x)
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3xy^2+6x^2y^2+9x^2
=3xy^2+6xx+9xx
=3xy^2+2.3xx+3.3xx
=3x(y^2+2xy^2+3x)