Answer
$2x^{2}y-2xy-13y^{2}$
Work Step by Step
$(2x^{2}y+5xy-4y^{2})-(7xy+9y^{2})$
$=2x^{2}y+5xy-7xy-4y^{2}-9y^{2}$
$=2x^{2}y-2xy-13y^{2}$
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