\[\boxed{\mathbf{337}.}\]
\[x + y = 3;\ \ \ xy = - 2:\]
\[(x + y)^{2} = x^{2} + 2xy + y^{2} =\]
\[= x^{2} + y^{2} + 2 \cdot ( - 2) =\]
\[= x^{2} + y^{2} - 4 = 9\]
\[x^{2} + y^{2} = 13;\]
\[2x^{2} - 3xy + 2y^{2} =\]
\[= 2 \cdot \left( x^{2} + y^{2} \right) - 3xy =\]
\[= 2 \cdot 13 - 3 \cdot ( - 2) =\]
\[= 26 + 6 = 32.\]
\[Ответ:32.\]