3. Point form of Gauss's Law (15 pts): Given an electric field E = 3 â, + 2xy ây +8x²y³âz V/m. a) Find an expression for the charge density p,(x,

y, z). b) Find the total flux through the surface of a cube with 0 <= x <= 2,0 <= y <= 2,and 0 <= z <= 2.