what is the pattern of 0,5,20,48,80 please help devin

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- Sep 19th 2006, 04:12 PMDevin Bruggersimple math pattern
what is the pattern of 0,5,20,48,80 please help devin

- Sep 19th 2006, 04:30 PMThePerfectHacker
- Sep 19th 2006, 05:14 PMtopsquark
- Sep 19th 2006, 05:18 PMdan
ok PH, i'm impressed....how in the world did you come up with that?? what is the strategy to finding patterns..??

- Sep 19th 2006, 05:34 PMThePerfectHacker
Thank you, I am humanities gift from the gods I cannot tell you how I found that.

Okay, okay I be honest.

I used something called "method of least squares" for polynomials. It works for other class of functions. When I use this I looks whether or not this function is "good" looking. Meaning are the coefficients nice or ugly? If nice like here I assume that is the pattern. Captain**Blank**referrs to it as the "Lagrange Interpolating polynomial".

In fact I can prove that given a sequence:

a_0,a_1,...,a_(n-1)

We can find a unique polynomial having a degree up to (n-1) with precisely satisfies this equation. (The prove is based on being able to solve a system of linear equations). - Sep 20th 2006, 12:36 AMCaptainBlack
- Sep 20th 2006, 12:42 AMCaptainBlack
No I don't, the Lagange interpolating polynomial is constructed to exactly

go through the points. It just so happens that a least squares polynomial

fit of a degree n-1 polynomial to a squence of n points must also go through

the points and so in practice is identical to the Lagrange polynomial, but

they differ in their method of construction.

Here the least square and the Lagrange polynomials are the same but the

distinction between them remains as it lies in their methods of construction.

RonL

RonL - Sep 20th 2006, 04:29 AMtopsquark
The problem is that this sort of solution is almost never the solution to this kind of problem. Odds are there is some method to construct the terms of the series and your polynomial will not predict the next one. (I tried this once as the solution to a "Math Challenge" and the professor's granted that I had found a solution, just not the right one. :) ) Though I will grant it was a nice piece of work. ;)

-Dan - Sep 20th 2006, 05:44 AMCaptainBlack
- Sep 20th 2006, 06:05 AMtopsquark
- Sep 20th 2006, 06:10 AMCaptainBlack
It's the sluggishness of the world wide wait (at least at work in the

lunch hour:mad: ) results in me editing a post while the original is uploading

without noticing, then hitting submit again:o

Its also a type of double posting I don't mind too much when others do

it. Near identical posts in the same thread (of forum) are usually finger

trouble, best way to deal with them is to just delete the duplicate.

RonL