Solving Coulomb's Law Homework Problem

[lucer95]

Homework Statement

Having trouble with my vector addition when it comes to this homework question. Not really sure how to go about solving this problem since I'm new to coulomb's law problems and my prof didnt really give us many examples in class. Here is the picture of the charges. The question asks:
A)What is the force F⃗ on the 1.0 nC charge and Determine the magnitude of the force F.
B)Determine the direction of the force F⃗ .
Assume that +x axis is directed from the 2.0 nC charge to the -2.0 nC charge

Homework Equations

eqn for coulomb's F=K(q1)(q2)/r^2 K=9.0x10^9

I named q1=-2.0nC=-2.0X10^-9 C
q2=2.0nC=2.0X10^-9 C
q3=1.0nC=1.0X10^-9 C

The Attempt at a Solution

I tried doing the action reaction force of F(1on2) but not sure what to do with the angles and also not sure if my answers make sense since i was getting very large answers.

 

[lucer95]

Should also mention r=1.0cm=0.01m