Imagine a triangle top right says a a line goes straight across bottom left corner is b then to complete the triangle the c is in the bottom corner

I need the strength and distance of the electrical field from point b

A has a charge which says qa=+4 UC and from point A to B it says 4CM

Point C has a charge says qc=8 UC and from point C to B it’s 3 CM I need steps my mind is about to explode trying to solve this