The potential in a region of space due to a charge distribution is given by the expression V = ax2z + bxy - cz2 where a = -5.00 V/m3, b = 3.00 V/m2, and c = 9.00 V/m2. What is the electric field vector at the point (0, -3.00, -8.00) m? Express your answer in vector form. E = V/m