1. The problem statement, all variables and given/known data A 1.5 10-9 C charge is at the origin, and a -1.50 10-9 C charge is 4.5 m to the right on the positive x-axis. The electric potential is -1.8 V at a point on the x-axis that is a distance d to the right of the negative charge. Find d. 2. Relevant equations V = k [sum] (q/r) 3. The attempt at a solution -1.8V = k [(1.5 x 10-9 / 4.5 + x ) + (-1.5 x 10-9 / x )] Maybe I'm doing the algebra incorrectly, but I continue to get the wrong answer although I think the set-up is correct.