[PDF] 26 Zeros of Polynomials and Horner’s Method



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A Note on Horner’s Method - Illinois Wesleyan University

advantage of Horner’s method is the di erentiation of P(x): P0(x) = Q(x) + (x x 0)Q 0(x): Hence, P0(x 0) = Q(x 0), which is very convenient when applying New-ton’s method to nd roots of a polynomial Example 1 As an example, we use Horner’s method to evaluate P(x) = x4 2x2 +3x 4 at x 0 = 1 First we construct the synthetic division as



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Horner’s method is a standard minimum arithmetic method for evaluating and deflating polynomials It can also efficiently evaluate various order derivatives of a polynomial, therefore is often used as part of Newton’s method This note tries to develop the various techniques called Horner’s method, nested evaluation, and



26 Zeros of Polynomials and Horner’s Method

Horner’s Method •Horner’s method is a technique to evaluate polynomials quickly Need multiplications and additions to evaluate ????0 •Assume ????= ???? + −1???? −1+⋯+ 1????+ 0



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Horner’s Rule Horner’s rule is an efficient algorithm for converting a number written in base b into its decimal notation Horner’s rule is also useful for evaluating a polynomial, and Taylor coefficients Evaluating polynomials by Horner’s rule is coveredelsewherein this course Horner’s Rule Consider the natural number 43



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314 Mr HORNER'S new method of solving numerical of the figurate coefficients in that formula of the theorem, of which such letter is the first term 14 Although this statement appears only to have returned to us the conditions of Art 6, with all their disadvantages, and to have merely substituted AI for DqR' or a' B2 for D2R'or b'



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A specialized version of synthetic division called Horner’s Method is used to effi-ciently find the value of a polynomial and its first derivative for a given value of c Implementations of synthetic division and Horner’s Method as TI-Nspire functions are presented and demonstrated in the file syndiv tns, the TI-Nspire document that accom-



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multiplications in Horner’s method is O(n) (“ of the order of n ”) and that the time complexity of Horner’s method is O(n) 12-17

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2.6 Zeros of Polynomials and

Horner's Method

1 2

Zeros of Polynomials

Definition: Degree of a Polynomial

A polynomial of degree ࢔ has the form

Fundamental Theorem of Algebra

If ܲT is a polynomial of degree ݊Rs, with real or complex coefficients, ܲ

Corollary

Remark:

1.Collection of zeros is unique

2.݉௜ are multiplicities of the individual zeros

3.A polynomial of degree ݊ has exactly ݊ zeros, counting

multiplicity.

Corollary

Let ܲ:T; and ܳ

for all values of ݔ.

Remark:

If two polynomials of degree ݊ agree at at least (n+1) points, then they must be the same. 3

Horner's Method

quickly. Need ݊ multiplications and ݊ additions to evaluate

Assume ܲ

Evaluate ܲ

Let ܾ

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