Geometric/algebraic proof of a quadratic

In summary, the conversation discusses a question regarding constructing an algebraic proof from given lengths and points in a geometry problem. There is uncertainty about the question and possible approaches for solving it, such as using coordinate geometry.
  • #1
raphael3d
45
0
http://img717.imageshack.us/img717/4029/screenshot20110106at123.png

i don't know how to construct an algebraic proof from this or how to attempt it.
is there anything obvious which i missed?


thank you
 
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  • #2
I think the question is badly put. By varying the value of c, one can ensure that P'Q' does not cut the circle. So there would be no M and N.

Perhaps they mean that if there is an M and N, then QX and QY will be the roots of the equation.

One way you could solve it is:
- find the coordinates of N and M, assuming they exist
... rest removed.
 
Last edited:
  • #3
one can then also vary P' and Q' so they do cut the circle at points M and N, so the construction seems consistent.

its an example from "course in pure mathematics" from g.h.hardy

how should one find points like M and N, if only lengths are given and asked?
this is no function space, just geometry.

for instance: QN/2=NY/QY, but how could someone proceed then?
 
  • #4
If you know how to solve it with coordinate geometry, you can translate the proof to the form you require. For example, using the gradient of P'Q' is possible without coordinates.
 

FAQ: Geometric/algebraic proof of a quadratic

What is a geometric/algebraic proof of a quadratic?

A geometric/algebraic proof of a quadratic is a method of proving the properties and relationships of quadratic equations using both geometric and algebraic concepts. It involves using geometric figures, such as squares and rectangles, to visually represent and verify the algebraic equations.

Why is a geometric/algebraic proof important?

A geometric/algebraic proof is important because it provides a deeper understanding of quadratic equations and their properties. It allows us to visualize and verify the relationships between the coefficients and variables in a quadratic equation, rather than just solving for a numerical solution.

What are the steps involved in a geometric/algebraic proof of a quadratic?

The steps involved in a geometric/algebraic proof of a quadratic include:

  • 1. Drawing a geometric figure to represent the quadratic equation.
  • 2. Labeling the figure with the given values and variables.
  • 3. Using algebraic manipulation and properties to prove the relationships between the values and variables.
  • 4. Showing the visual representation of the proof using the geometric figure.

What are some common geometric figures used in a geometric/algebraic proof of a quadratic?

Some common geometric figures used in a geometric/algebraic proof of a quadratic include squares, rectangles, and triangles. These figures are used to represent the different terms and coefficients in a quadratic equation and their relationships.

How does a geometric/algebraic proof differ from a traditional algebraic proof?

A geometric/algebraic proof differs from a traditional algebraic proof in that it uses both visual representations and algebraic manipulation to prove the relationships between the values and variables in a quadratic equation. It provides a more intuitive understanding of the concepts and allows for a more thorough verification of the solutions. Traditional algebraic proofs, on the other hand, rely solely on algebraic equations and manipulations to prove the relationships.

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