How to Formulate a 6x6 Matrix for a 5th Degree Polynomial?

Click For Summary
SUMMARY

The discussion focuses on formulating a 6x6 matrix for a 5th degree polynomial defined by the equation y=a0+a1x+a2x^2+a3x^3+a4x^4+a5x^5, using the points (-2,21), (-1,7), (0,-10), (1,-8), (2,20), and (3,9). Participants emphasize that the coefficients a0 through a5 are the unknowns, while the y-values from the points form the rightmost column of the matrix. The solution involves creating a system of six equations corresponding to the six unknowns, which can be solved using elementary row operations or computational software.

PREREQUISITES
  • Understanding of polynomial equations and their coefficients
  • Basic knowledge of matrix formulation and linear algebra
  • Familiarity with elementary row operations
  • Experience with computational tools for solving linear systems
NEXT STEPS
  • Learn how to construct matrices from polynomial equations
  • Study Gaussian elimination for solving systems of linear equations
  • Explore software tools like MATLAB or Python's NumPy for matrix operations
  • Investigate polynomial interpolation techniques, such as Lagrange interpolation
USEFUL FOR

This discussion is beneficial for students studying linear algebra, mathematicians working with polynomial equations, and anyone interested in numerical methods for solving systems of equations.

Bob Ho
Messages
18
Reaction score
0

Homework Statement


y=a0+a1x+a2x^2+a3x^3+a4x^4+a5x^5
(a0,a1...,a5, are fixed real numbers) passes through the points

(-2,21), (-1,7), (0,-10), (1,-8), (2,20), (3,9)

Question: Write down a 6x6 matrix A such that;


... .a0... ...21
. . .a1... ...7
. . .a2... ...-10
A . ..a3.. .= ...-8
. . .a4... ...20
. .a5... ...9




The Attempt at a Solution



I am unsure how to start this question. Do i substitute the points?

Any assistance would be obliged.
 
Last edited:
Physics news on Phys.org
You need only very slight linear algebra knowledge to begin.

Your coefficients are the unknowns, and the x and y values are given as the points.
You will have six equations and six unknowns. The column of y values should be the rightmost column in your matrix. Just elementary row operations (if this is not too simple-minded) could take much time. Might you be allowed to use a software?
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
18K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 6 ·
Replies
6
Views
5K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 6 ·
Replies
6
Views
4K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 5 ·
Replies
5
Views
4K
  • · Replies 15 ·
Replies
15
Views
4K