Twice I posted this question and both times I got wrong answer , plz give typed clean and correct solution with explanation. .... Two charges +Q and -7Q are placed on the x axis with x coordinates=4m and 8m respectively.Find the coordinate of a point on the x axis between the two charges at which the potential iszero. Assuming that the potential at an infinite distance from these charges is zero. The Coulomb'slaw constant-k=8.99x10⁹Nm²/C².

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Answered: Two charges +Q and -7Q are placed on…

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Could you possibly include a picture of the written solution, the transcription gets a bit confusing! Thank you :)
answer they attaced question
For (b), why do we divide the (100Wx8h) by (103Wh)? I get that we need to cancel out the Wh, but why do we divide by 103 specifically?
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