l need detailed answer basicly solution manuel answer is 34,39

A thin rod extends along the z -axis from z = -d to z = d. The rod carries a positive charge Quniformly distributed along its length 2d with charge density 13.1 C/m. What is the change in potential energy if electrons move from z = 4d to z = 3d?(Take elementary charge 1,6x10-19 Cand take Coulomb's constant 910NM2C2). Write your answer in multiples of 1010 Nm. And write your answer in two decimal places. Correct! 34.39