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#1 2009-08-23 16:14:16

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,634

Difference of Two Cubes

A (rather too short) page on the Difference of Two Cubes


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#2 2009-08-23 22:13:48

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 107,815

Re: Difference of Two Cubes

Hi MathsisFun;

It does some nifty expansions like:

calling a= 5x and b =2

So numbers like 15617 which equal 25^3 - 2^3 can be factored  but not always into primes.

15617 = (23)(679)


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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