Al-Khwarizmi's 6th quadratic case

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Discussion Overview

The discussion revolves around understanding Al-Khwarizmi's 6th algebraic equation, specifically the interpretation of the phrase "halve the number of roots" in the context of the equation bx+c=x^2. Participants are exploring definitions and implications related to roots in quadratic equations.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • Kevin expresses confusion about the term "number of roots," questioning whether it refers to one root for a square and whether he is defining "roots" correctly.
  • Another participant clarifies that the number of roots corresponds to the highest degree of the polynomial, suggesting that roots can be equal or different.
  • A participant proposes that "halve the number of roots" might mean to "find the average of the roots," indicating a method to approach the problem.
  • Another participant suggests that the phrase should be interpreted as "halve the coefficient of x," leading to the term ## \frac b2 ##.
  • Kevin acknowledges that the interpretation he suggested aligns with the previous contributions, indicating some level of agreement on the interpretation.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the interpretation of "halve the number of roots," with multiple competing views presented regarding its meaning and implications.

Contextual Notes

There are limitations in the discussion regarding the clarity of the original text and the assumptions made about the definitions of roots and coefficients in the context of quadratic equations.

KevinMWHM
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The problem: I need to come up with a formula based on Al-Khwarizmi's 6th algebraic equation; bx+c=x^2.

I'm just having a definition problem that's holding me up from moving forward.

The first line of his solution is to "halve the number of roots". What is meant by "number of roots"? Number of roots for a square is just one, isn't it? Or am I defining "roots" wrong in this case?Thanks
-Kevin
 
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KevinMWHM said:
The problem: I need to come up with a formula based on Al-Khwarizmi's 6th algebraic equation; bx+c=x^2.

I'm just having a definition problem that's holding me up from moving forward.

The first line of his solution is to "halve the number of roots". What is meant by "number of roots"? Number of roots for a square is just one, isn't it? Or am I defining "roots" wrong in this case?Thanks
-Kevin
The number of roots is always equal to the highest degree of the polynomial. The roots may be equal, or they may be different, as the case may be.
 
Moved from Homework section. @KevinMWHM, if you post in the homework sections, you need to use the homework template.
 
Antique text translated, they express themselves not in our language, in the ordinary and the mathematical sense.

I'll make a reasoned guess what may be meant could be "find the average of the roots". Which you can certainly do.
Then the distance from there to the roots is the same for both, so you are only having to find one thing.
Put it this way, if you can express the quadratic as the difference between the square of the mean and the square of a root, (m2 - x2) then you can solve it. I don't know if you have the whole text or jusr this fragment, but in the former case there should be other indications of whether this is the idea.
 
Google is your friend and quickly leads to this page: http://www-groups.dcs.st-and.ac.uk/history/Extras/Al-Khwarizmi_quadratics.html

From this example it is clear that the translation "halve the number of roots" should be interpreted as "halve the coefficient of x", which gives you the term ## \frac b2 ##
 
Looks like I was about right?
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