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

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
Transcribed Image Text: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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