Please help me and write out the symbolic answer and units check as well

Name: Recitation Instructor: Two protons are fixed in place along the z-axis, a distance Representation: 0 1 2 r = 12.0 nm apart. Then an electron is placed midway Physics Concept(s): 0 1 2 between them. Suppose that the electron is moved a dis- Initial Equation(s): 0 0.5 1 tance d = 3.0nm to the right along the z-axis. What is Symbolic Answer: 0 1 the change in the system's electric potential energy AE PE Units Check: 0 05 1 that results from moving the electron? The symbolic an- Neatness: 9 | swer should be stated in terms of r, d, k, and e, though Total: not all of these quantities may be needed. Correct Answer: Y N Representation Physics Concept(s) | (Refer to the list of concepts on Carmen under modules/course documents.) (1) (2) { Show your equation work on next page | Initial Equation(s) Algebra Work |(Symbols only. Don't plug in any numbers yet.)