Charge Q1 = 6.0 nC is at (0.30 m, 0), charge Q2 = -1.0 nC is…

Charge Q1 = 6.0 nC is at (0.30 m, 0), charge Q2 = -1.0 nC is at
(0, 0.10 m), and charge Q3 = 5.0 nC is at (0, 0). What are the
magnitude and direction of the net electrostatic force on the
5.0-nC charge due to the other charges?
Please show all work since i know the final answer but dont know
how to find it