tailieunhanh - Burden - Numerical Analysis 5e (PWS, 1993) Epside 1 Part 5

Tham khảo tài liệu 'burden - numerical analysis 5e (pws, 1993) epside 1 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Zeros of Polynomials and Muller s Method 91 Ị Ĩ I ị 1 er s I I ials s the T ion for ave 1 0 a - .Ĩ tse Ị one 1 . i 3. Repeat Exercise 1 using Muller s method. 4. Repeat Exercise 2 using Muller s method. 5. Use Newton s method to find within 10 3 the zeros and critical points of the following functions. Use this information to sketch the graph of a. f x X3 9x2 12 b. fix X4 2x3 - 5x2 -r 12x 5 6. P x 10x3 - 0 has a root at X . Use Newton s method with an initial approximation x0 to attempt to find this root. What happens 7. a. Prove Corollary . b. Prove Corollary . 8. Prove Theorem . Hint First consider the case m 1 and note what happens to the constants if a bi is not a zero of P x . 9. Prove the following theorem Theorem LetP x anxn -r aye aQ be a polynomial of degree n and let x0 be a positive real number with p xf 0. If Q x satisfies P x x Xq Q x -Ĩ- P x0 x XqXỉ x 1 b2x 4- bj P x0 and bi 0 for i 1 2 . . n then all real zeros of p are less than or equal to x0. 10. The Legendre polynomials can be generated recursively by P0 x 1 Pfx X and 2n 3 nTl i n zW n itó---------------- W-PflCO w 0- These polynomials and them roots will n 2 n 2 be considered in Sections and . Table on page 209 lists the zeros of p2 P3 p4i and p5. a. Determine these polynomials and verify that the values in the table are correct. b. Determine P6 and approximate the zeros of this polynomial to within IO-6. 11. The Chebyshev polynomials can be generated recursively by T0 x Ỉ Tfx X and Tn 2 x lxTn l x Tfx n 0. These polynomials and them roots will be considered in Section . a. Determine T2 T3 T4 and T5. b. Approximate to within 10-6 the zeros of T3 Tfi and T5. c. Show that the results in part b are consistent with the result in Theorem . 12. The Laguerre polynomials can be generated recursively by Lfx 1 i x 1 X and Ln 2 x 2n 3 - x L fx - n -r 1 2 X n S 0. a. Determine 2 and L5. b. Approximate to within 10 4 the zeros of 3 4 and 5. 13.

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