The image shows the net E-field vectors of two opposite charges. Prove that the computer shows the correct vectors produced by the charges.

I've figured out the net vetor of the sensor placed halfway between the two charges but can not get the correct answer for the other two sensors. Please help!!

http://d2vlcm61l7u1fs.cloudfront.net/media%2Ffd1%2Ffd1d7e7a-cf71-465d-8064-0ccc4ff51d28%2Fphp8n3OBV.png

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