\(V = (2xy + y^2z + x^2yz)\)
\(E = -\triangledown V\)
\(= -\left(\frac\partial{\partial x} + \frac\partial {\partial y } + \frac\partial {\partial z}\right)V\)
\(= -\left(\frac{\partial V}{\partial x} + \frac{\partial V} {\partial y } + \frac{\partial V} {\partial z}\right)\)
\(= - [(2y + 2xyz) + (2x + 2yz + x^2y) + (y^2 + x^2y)]\)
\(= - [(6 + 12)+ (4 + 2 \times 3 \times 1 + 4 \times 3)+ ( 9 + 4 \times 3)]\)
\(= -[18+22+21]\)
\(= -[18+ 43]\)
\(= -[61]\,N/C\)