can any1 explain why this iteration:(adsbygoogle = window.adsbygoogle || []).push({});

Xn+1 = Xn(2 - NXn)

can be used to find the reciprocal of N. I dont ned proof or to show that it does but i would like to know if sum1 can break it down and explain how it does it.

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# Xn+1 = Xn(2 - NXn) can be used to find the reciprocal

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