I need help with this question. I have been using the k*q1*q2/r^2 but it seems I am missing some steps.

X Question 3 0/ 1 A charge of 4 micro-C and a charge of -6 micro-C are separated by 6 cm on the x-axis. What is the electrostatic force exerted on each charge? (Use positive values for a repulsive force, and negative values for a attractive force). Round your answer to 3 decimal places. Your Answer: Incorrect The answer is -60.000 + 5%