http://tinypic.com/view.php?pic=2622lxs&s=5
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After distribution and reordering one thing you end up with
6xy + 12xy^2 + 2xy^2 + 9(x^2)(y^2) - 16(x^2)(y^2)
then you combine like terms and get
6xy + 14xy^2 - 7(x^2)(y^2)
6xy + 12xy^2 + 2xy^2 + 9(x^2)(y^2) - 16(x^2)(y^2)
then you combine like terms and get
6xy + 14xy^2 - 7(x^2)(y^2)
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6xy+14xy²-7x²y²