Polynomial Definition and 1000 Threads

Homework Statement Let T: P2 --> P3 be the transformation that maps a polynomial p(t) into the polynomial (t+5)p(t). a) find the image of p(t)= 2-t+(t^2) b) Find the matrix for T relative to bases {1,t,t^2} and {1,t,t^2,t^3}. Homework Equations Given The Attempt at a Solution a) I know...

Homework Statement How many pairs of solutions make x^4 + px^2 + q = 0 divisable by x^2 + px + q = 0 Homework Equations x1 + x2 = -p x1*x2= q[/B] The Attempt at a Solution I tried making z = x^2 and replacing but got nowhere. I figure 0,1,-1 are 3 numbers that fit but I am not sure what's...

Hello, My problem is the same as osnarf's problem in thread "Polynomial division proof", https://www.physicsforums.com/threads/polynomial-division-proof.451991/ But, I would like some further help. The problem: Prove that for any polynomial function f, and any number a, there is a polynomial...

Hi, I'm trying to help a high-school sophomore with a math problem, and unfortunately my algebra days are long behind me. Here's the equation: x^3-9x-440=0 I know x=8, but I don't know how to find it. I'd appreciate some guidance. Thanks.

Homework Statement z^6+(2i-1)z^3-1-i=0 Homework EquationsThe Attempt at a Solution I know that I must put k=z^3 and solve the quadratic. But I'm not able to simplify the quadratic. I get the square root of (-8i+1) What am I supposed to do ?

Homework Statement Starting from the recurrence relation, show that, when l is an integer, the polynomial solution to Legendre's equation is yl(x) = Kl ∑ from k = 0 to (l/2) of (((-1)k) / k!) (((2l - 2k)!) / (l-k)! (l - 2k)!) (xl-2k) where Kl is an arbitrary constant (depending on l) and x...

If p and q are prime numbers such that p is not a quadratic residue mod q. Show that if pq=-1 mod 4 then the polynomial f(x)=x^2-q is irreducible in F_p[x].

Just to double check, but if one wanted to, like in partial fraction decomposition, associate literal coefficients of polynomials with corresponding unknowns on the other side of the equation, the justification for this action is the definition of equality of polynomials? EDIT: I know this...

I would like to know if it is possible to determine if a polynomial has rational zeroes, or, in other words, is unfactorable using whole numbers. For example 4x^3+2x^2-4x+25. I know you can use trial and error to sub in the factors of 25, and I understand the rational root theorem. However, I...

Hi - does anyone know of a program library/subroutine - failing that some other source, to find the zeros of a generalised Laguerre polynomial? ie. ## L^{\alpha}_N (x_i) = 0 ##

Hi - does anyone know of a program library/subroutine/some other source, to find the zeros of a generalised Laguerre polynomial? ie. $ L^{\alpha}_N (x_i) = 0 $

Homework Statement For $$\lim _{ x\rightarrow \infty }{ \frac { { x }^{ 2 }+{ e }^{ -{ x }^{ 2 }\sin ^{ 2 }{ x } } }{ \sqrt { { x }^{ 4 }+1 } } } $$, determine whether it exists. If it does, find its value. if it doesn't, explain. Homework Equations Sand witch theorem and arithmetic rule...

Homework Statement I'm not 100% sure what this type of problem is called, we weren't really told, so I'm having trouble looking it up. I'd really appreciate any resources that show solved examples, or how to find some! Anyway. For the solution to the spherical wave equation φ(t, θ, Φ) i)...

I knew that a polynomial of degree n has n+1 basis, i.e 1,x,x^2...x^n; But what if a0=0,i.e the constant term is 0, like x^3+x, then what is the dimension and the basis? Is there only x(one dimension) as the basis?

I have been given a task to create an interpolating/extrapolating programme. I have completed the programme for linear interpolation (2 points) but now must make it usable for 3 or more points, ie a polynomial of n points. I think I have the equation in general for a polynomial as it is an...

Homework Statement Let A be the algebra \mathbb{Z}_5[x]/I where I is the principle ideal generated by x^2+4 and \mathbb{Z}_5[x] is the ring of polynomials modulo 5. Find all the ideals of A Let G be the group of invertible elements in A. Find the subgroups of the prime decomposition.Homework...

Homework Statement Hi,I have a problem regarding to one of the questions in my homework.Actually I am not trying to ask for the solution.I am just not sure what the question is asking for.Please see the attachedHomework EquationsThe Attempt at a Solution In 5(c),the summation notation stated...

I was reviewing the Cardano's method formula for a real cubic polynomial having 3 real roots. It seems that to do so, the arccos (or another arc*) of a term involving the p & q parameters of the reduced cubes must be done, and then followed by cos & sin of 1/3 of the result from that arccos -...

Homework Statement solve 3x4+2x2-4x+6≥6x4-5x3-9x+2 Do not use technology (i.e.-graphing calculators) Homework Equations Remainder Theorem The Attempt at a Solution I set the inequality equal to zero -3x4+5x3+3x2+5x+4≥0 Checking all the Possible rational roots for a possible factors... none...

1. Integrate the following: (4x - x^2)^1/2 dx 2. Any assistance would be appreciated.3. Honestly don't know where to start.

Umm from memory I used to use...that triangle: 1 1 1 1 2 1 1 3 3 1 Fibonachii was it? Pathetic I can't even remember the name. To factorise...or was it expand...polynomials...anyway, I don't think that's elevant here. My question is; I had an...

Why is $$ \left(x^2-1\right)\frac{d}{dx}\left(x^2-1\right)^n = 2nx\left(x^2-1\right)^{n-1} $$? This is in a textbook and says that its proof is left as an exercise. It seems to be a difficult equality. I believe this should just be $$ \left(x^2-1\right)\frac{d}{dx}\left(x^2-1\right)^n =...

I should factorize following polynomial: P(x)=x^2n + 2cos(naπ)x^n + 1 in ℝ if i know that a is irrational number. Things that confuse me here are following: 1. When factorizing polynomials, i have known exponents (unlike here, where i have 2n and n) so i don't know what to do with them? 2...

I am trying to gain an understanding of the basics of elementary algebraic geometry and am reading Dummit and Foote Chapter 15: Commutative Rings and Algebraic Geometry ... At present I am focused on Section 15.1 Noetherian Rings and Affine Algebraic Sets ... ... I need someone to help...

Homework Statement The polynomial of order ##(l-1)## denoted ## W_{l-1}(x) ## is defined by ## W_{l-1}(x) = \sum_{m=1}^{l} \frac{1}{m} P_{m-1}(x) P_{l-m}(x) ## where ## P_m(x) ## is the Legendre polynomial of first kind. In addition, one can also write ## W_{l-1}(x) = \sum_{n=0}^{l-1} a_n \cdot...

I am trying to gain an understanding of the basics of elementary algebraic geometry and am reading Dummit and Foote Chapter 15: Commutative Rings and Algebraic Geometry ... At present I am focused on Section 15.1 Noetherian Rings and Affine Algebraic Sets ... ... I need help to get...

So I'm supposed to find all the real zeros of this polynomial function: $\int$ $\left(x\right)$ = $x^3$ + 3$x^2$ - 4$x$ - 12 Usually, to find the zeros, I would use the quadratic function $\frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$ But what do I do with the 3 at the beginning of the function? I...

I wrote x² - (a + b)x + (ab) in the wolfram and polynomial discriminant was: a² - 2ab + b². Factoring: (a-b)² --- So, I wrote x³ - (a+b+c) x² + (bc+ca+ab) x - (abc) and the polynomial discrimant given was: Factoring: (b-c)² (c-a)² (a-b)² --- Now, I wrote x² - 2Ax + B² and the polynomial...

I am reading Paul E. Bland's book, "The Basics of Abstract Algebra". I am currently focused on Chapter 6: Polynomial Rings. I need help with an aspect of Theorem 6.3.17. Theorem 6.3.17 requires awareness of the notation of Definition 6.3.15 which reads as follows...

I am reading Joseph J. Rotman's book: A First Course in Abstract Algebra with Applications (Third Edition) ... I am currently focused on Section 3.7 Irreducibility... [FONT=Times New Roman][FONT=Times New Roman]I need help with an aspect of the proof of Theorem 3.97. Theorem 3.97 and its...

How to express ##\cos 3x## as a polynomial in ##\cos x##?

so i transferred to a new school and I'm collaborating with another pre-cal teacher. she is kind of helpful but i can tell she doesn't really want to share her work (even though collaboration is about helping each other out). She already made a unit test, but i had to make my own answer key. I...

Homework Statement Hello! I understand that this is a very simple thing, but somehow I can't find the key :) Please, take a look a pictures attached with a problem and an answer. The task is to create a polynomial f with real number coefficients which has all of the desired characteristics...

I seem to have encountered a situation in which I have a quartic which has solutions, but no factors. The polynomial is: x^4 - 8x^2 + 224x - 160 = 0 I attempted to find the factors for this quartic in the following manor f(x) = x^4 - 8x^2 + 224x - 160 f(1) = (1)^4 - 8(1)^2 + 224(1) - 160...

Some values of sine and cosine can ben expressed how the root of a polynomial of nth degree. Example:http://www.wolframalpha.com/input/?i=cos%28%28180%2F7%29%C2%B0%29 (Roll the scroll still you find: "alternate forns" and see the associated polynomial: " x³ - 4 x² - 4 x + 1") So, where I can...

Hello let be $$E = \mathbb{R}[X]$$ with the norme $$||P|| = sup_{t \in \mathbb{R}}e^{-|t|}|P(t)|$$. Let be $$A \in E$$. How to show that $$\Psi_{A} : P \rightarrow AP$$ is not continue please? Thank you in advance and have a nice afternoon:oldbiggrin:.

I am trying to use a numerical polynomial root finding method, but I am unsure of the order of an expression. For example, if I have something that looks like x2+5x √(x2+3)+x+1=0 what is the coefficient of the second order (and potentially even the first order) term? Is the entire 5x√... term...

I am reading John Fraleigh's book, A First Course in Abstract Algebra. I am at present reading Section 22: Rings of Polynomials. I need some help with an aspect of Fraleigh's discussion of "solving a polynomial equation" or "finding a zero of a polynomial" ... The relevant text in Fraleigh...

I am reading Ernst Kunz book, "Introduction to Plane Algebraic Curves" I need help with some aspects of Kunz' definition of the vanishing ideal of an algebraic curve and Kunz' definition of a minimal polynomial ... The relevant text from Kunz is as...

U = A a² V = 2 A a b W = A b² u = 2 A a c + B a v = 2 A b c + B b w = A c² + B c + C I'd like to solve this system for A, B, C, a, b, c. Is it possible!?

I am reading Joseph J.Rotman's book, A First Course in Abstract Algebra. I am currently focused on Section 3. Polynomials I need help with the a statement of Rotman's concerning the polynomial functions of a finite ring such as $$ \mathbb{I}_m = \mathbb{Z}/ m \mathbb{Z} $$ The relevant...

How can I find an Integral of an exponential with Polynomial argument with finite limits: \int_0^\pi \exp^{-a x^2 -b x^4} dx \\ \int_0^\pi \exp^{-a x^2 -b x^4} (x - x^3)dx

Is any Irrational Roots Theorem been developed for polynomial functions in the same way as Rational Roots Theorems for polynomial functions? We can choose several possible RATIONAL roots to test when we have polynomial functions; but if there are suspected IRRATIONAL roots, can they be found...

Hello! (Wave) For polynomial multiplication, if $A(x)$ and $B(x)$ are polynomials of degree-bound $n$, we say that their product $C(x)$ is a polynomial of degree-bound $2n-1$ such that $C(x)=A(x)B(x)$ for all $x$ in the underlying field. A way to express the product $C(x)$ is $$C(x)=...

Hello! (Wave) The differential equation $xy''+(1-x)y'+ay=0, a \in \mathbb{R}$, that is called equation Laguerre, is given. Let $L_n$ be the polynomial $L_n(x)=e^x \frac{d^n}{dx^n} (x^n \cdot e^{-x})$ (show that it is a polynomial), $n=1,2,3, \dots$. Show that $L_n$ satisfies the equation...

This is something Chebyshev polynomial problems. I need to show that: ##\sum_{r=0}^{n}T_{2r}(x)=\frac{1}{2}\big ( 1+\frac{U_{2n+1}(x)}{\sqrt{1-x^2}}\big )## by using two type of solution : ##T_n(x)=\cos(n \cos^{-1}x)## and ##U_n(x)=\sin(n \cos^{-1}x)## with ##x=\cos\theta##, I have form the...

From Vieta's Formulas, I got: $a=2r+k$ $b=2rk+r^2+s^2$ $65=k(r^2+s^2)$ Where $k$ is the other real zero. Then I split it into several cases: $r^2 + s^2 = 1, 5, 13, 65$ then: For case 1: $r = \{2, -2, 1, -1 \}$ $\sum a = 2(\sum r) + k \implies a = 13$ Then for case 2: $r^2 + s^2 = 13$, it...

One thing I have seen several times when trying to show that a polynomial p(x) is irreducible over a field F is that instead of showing that p(x) is irreducible, I am supposed to show that p(ax + b) is irreducible a,b\in F . This is supposedly equivalent. That does make sense, and I have a...

Homework Statement Let ##x_1,...,x_n## be distinct real numbers, and ## P = \prod_{i=1}^n(X-x_i)##. If for ##i=1...n ##, ##L_i = \frac{\prod_{j \neq i}^n(X-x_j)}{\prod_{j\neq i}(x_i-x_j)}##, show that for any polynomial A (single variable and real coefs), the rest of the euclidian division of A...

I've been studying for my final exam, and came across this homework problem (that has already been solved, and graded.): "Show that the Galois group of ##f(x)=x^3-1## over ℚ, is cyclic of order 2." I had a question related to this problem, but not about this problem exactly. What follows is...