A particle with charge -8 µC is located on the x-axis at the point 8 cm, and a s

Question

A particle with charge -8 µC is located on the x-axis at the point 8 cm, and a second particle with charge -6 µC is placed on the x-axis at -6 cm.

What is the magnitude of the total electrostatic force on a third particle with charge -4 µC placed on the x-axis at -2 cm?
Answer in units of N

The Coulomb constant is 9.0× 10^9 N·m2/C2.
Fe = (kq1q2/r^2)

My attempt:
[(9*10^9)(4*10^-6)(8*10^-6)]/(0.1)^2 + [(9*10^9)(4*10^-6)(6*10^-6)]/(0.04)^2

The final answer I get is 163.8 N, which is incorrect.

Please help me. ):

Explanation / Answer

106.2N. Since the forces are acting in opposite directions, you have to subtract.

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