Answer
$2x^2y+8xy$
Work Step by Step
Removing the grouping symbols and then combining like terms, the given expression, $
(-2x^2y+xy)+(4x^2y+7xy)
,$ simplifies to
\begin{array}{l}\require{cancel}
-2x^2y+xy+4x^2y+7xy
\\\\=
(-2x^2y+4x^2y)+(xy+7xy)
\\\\=
2x^2y+8xy
.\end{array}