\[p(x;y) = 3x^{2} + 7xy - 2y^{2};\]
\[p( - 1;2):\]
\[p = 3 \cdot 1 + 7 \cdot ( - 1) \cdot 2 - 2 \cdot (2)^{2} =\]
\[= 3 - 14 - 2 \cdot 4 =\]
\[= - 11 - 8 = - 19.\]