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How to get the cubic root with a basic calculator ? PDF Print E-mail
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Wednesday, 03 September 2008 09:06

How to get the cubic root with a basic calculator ?

 


 

 

This is original. Time ago I propose to find the cubic root using a basic calculator and of course using the square root.

It is not too much complicated. We will start for example with 27.

Just press 27 and square root twice. So, we get the 4√27.

Then multiply by 27 (the number), and again press square root twice.

Repeat this process again and again. Soon, you will get a number that does not change. In the case of 27, you will get 2.9999=3.

This is a sequence defined by the following terms:

an= 4√(x.an-1),

and it converges to 3√x. It is not complicated to prove.

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Last Updated on Thursday, 18 December 2008 06:22