In Problems 21–32, use Descartes’ Rule of Signs to determine how many positive and how many negative zeros each polynomial functionmay have. Do not attempt to find the zeros. 21. f(x) = --4x7 + x - x + 222. f(x) = 5x* + 2r – 6x – 523. f(x) = 2x° – 3x? – x + 124. f(x)- 3x + 4x* + 225. f(x) = 3x –- 2x² + x + 226. f(x) = -x – x² + x +1=27. f(x)-x* + x? - 128. f(x) = x* + 5x³ - 229. f(x) = x* + x* + x? + x + 1%3D30. f(x) = x³ – x* + x – x² + x – 131. f(x) = x – 132. f(x) = x + 1

Answered: 21. f(x) = - -4x7 + x - x + 2 22. f(x)…

Algebra: Structure And Method, Book 1

(REV)00th Edition

ISBN:9780395977224

Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Chapter8: Introduction To Functions

Section8.8: Linear And Quadratic Functions

Problem 4ST

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In Problems 21–32, use Descartes’ Rule of Signs to determine how many positive and how many negative zeros each polynomial function
may have. Do not attempt to find the zeros.

21. f(x) = -
-4x7 + x - x + 2
22. f(x) = 5x* + 2r – 6x – 5
23. f(x) = 2x° – 3x? – x + 1
24. f(x)
- 3x + 4x* + 2
25. f(x) = 3x –- 2x² + x + 2
26. f(x) = -x – x² + x +1
=
27. f(x)
-x* + x? - 1
28. f(x) = x* + 5x³ - 2
29. f(x) = x* + x* + x? + x + 1
%3D
30. f(x) = x³ – x* + x – x² + x – 1
31. f(x) = x – 1
32. f(x) = x + 1

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