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Vector fields

Problem

Two identical objects, Y1 and Y2, are each placed a distance X from point P as shown. Each object creates a vector field in the space around it that radiates away from the center of the object. The magnitude of each individual vector field at point P is F.
Two dotted lines extend from a point labeled P. One is vertical and extends down to a point labeled Y sub two. The other is horizontal and extends left to a point labeled Y sub one. Both dotted lines are labeled with the letter X.
What is the magnitude of the net vector field at point P due to Y1 and Y2?
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