1. The problem statement, all variables and given/known data Two point charges lie on the x axis. A charge of -2.5 µC is at the origin, and a charge of +8.5 µC is at x = 10.0 cm. What is the net electrical field at points x = +4 and at x = -4? 2. Relevant equations E = kq/r^2 3. The attempt at a solution For x = +4... E= 9x10^9(8.5x10^-6)/.06^2 = 21250000 E= 9x10^9(-2.5x10^-6)/.04^2 = -14062500 Net E = 7187500 (which is wrong) How do I solve this? Thanks.