How Do You Calculate the Electric Field at the Origin with Three Charges?

[StrSpeed]

Homework Statement

Three charges q1=+2Q q2=-2Q q3=-4Q. are each a distance d from the origin. What is the magnitude and direction of the electric field at the origin.

I'm getting confused by not having d specified as a number.

Homework Equations

E = Σ kq/r²

The Attempt at a Solution

I've determined the magnitudes of the three E vectors for each charge. I know I cannot algebraically sum them and that I have to use sin/cos to get their components however I don't know where to begin.
Thank you so much for your help!

 

[cnh1995]

Calculate the components along x and y axes. You know the angle already. Add them according to vector addition rule to get the resultant electric field.