Is |a| a Factor of |p0| in a General Polynomial of Degree n?

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Discussion Overview

The discussion revolves around the question of whether the absolute value of a, denoted as |a|, is a factor of the absolute value of the constant term |p0| in a general polynomial of degree n, given that (x-a) is a factor of the polynomial.

Discussion Character

  • Technical explanation, Conceptual clarification, Homework-related

Main Points Raised

  • One participant asks for assistance in proving that if (x-a) is a factor of the polynomial, then |a| must be a factor of |p0|.
  • Another participant suggests using the fundamental theorem of algebra to express the polynomial as a product of its root factors (x-r) and identifies p0 as the product of all roots r.
  • A different participant proposes evaluating the polynomial by substituting a for x to explore the relationship.
  • One participant encourages multiplying out the assumed equation to check the validity of the statement, suggesting that if one cannot do this, they may lack basic experimentation skills.
  • Another participant makes a light-hearted comment about celebrating their birthday and acknowledges the quality of contributions in the forum.
  • A further comment reflects on the effort taken to find questions to answer, indicating a playful engagement with the forum's content.

Areas of Agreement / Disagreement

Participants present various approaches to the problem, but there is no consensus on a definitive method or conclusion regarding the relationship between |a| and |p0|.

Contextual Notes

Some assumptions about the nature of the polynomial and the roots may be implicit, and the discussion does not resolve the mathematical steps necessary to establish the proposed relationship.

josephcollins
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Could someone please offer some assistance to answering this question?

Q) Show that if (x-a) is a factor of

(pnx^n) + (p(n-1)x^n-1) + ... p0 (General polynomial of degree n)

then |a| is a factor of |p0|.

Thanks a lot
 
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You may write your polynomial as a product of its (possibly complex) root factors (x-r)
(Fundamental theorem of algebra)
Identify the constant term (p0) as the product of all roots r.
 
Alternatively, see what you get when you plug in a for x.
 
just mu;ltiply out the equation you are assuming:

(x-a)(anx^(n-1) + a(n-1)x^(n-1)+...+a0) = (pnx^n) + (p(n-1)x^n-1) + ... p0 .


If you could not do this, you are not skilled yet at basic experimentation. Think about the emaning of the statement you are trying to check, then see if you can write that statement down precisely. then see if it is obvious.


(I am celebrating my birthday by having briefly all 10 of the most recent posts in this forum. I apologize if some or all of them are trivial.)
 
mathwonk said:
(I am celebrating my birthday by having briefly all 10 of the most recent posts in this forum. I apologize if some or all of them are trivial.)
You also deserve the title of "chief paleontologist" :wink:
(Note: I still think your excavations and answers are, in general, excellent)
 
well i had to dig pretty deep to find 10 questions i could think of answers to.
 

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