Caleb was determining the nature of the roots of the polynomial equation x* + 2x° +x +1 = 0. Follow Caleb's work below and identify his mistake. Then explain WHY it is wrong and show/tell Caleb how to correctly find the nature of the roots. Caleb's work/explanation: P(x) = x* + 2x +x +1 has 0 sign changes. P(-x) = -x* - 2r° – x2 – 1 has 0 sign changes. Since there are no sign changes for P(x), there are no positive roots. Since there are no sign changes for P(-x), there are no negative roots. Since none of the roots are positive or negative, all four roots must be complex.

Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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Caleb was determining the nature of the roots of the
2
polynomial equation x* + 2x° + x +1 = 0.
Follow Caleb's work below and identify his mistake.
Then explain WHY it is wrong and show/tell Caleb how
to correctly find the nature of the roots.
Caleb's work/explanation:
P(x) = x* + 2x +x +1 has 0 sign changes.
P(-x) = -x* - 2r° – x2 – 1 has 0 sign changes.
Since there are no sign changes for P(x), there are no
positive roots.
Since there are no sign changes for P(-x), there are
no negative roots.
Since none of the roots are positive or negative, all four
roots must be complex.
Transcribed Image Text:Caleb was determining the nature of the roots of the 2 polynomial equation x* + 2x° + x +1 = 0. Follow Caleb's work below and identify his mistake. Then explain WHY it is wrong and show/tell Caleb how to correctly find the nature of the roots. Caleb's work/explanation: P(x) = x* + 2x +x +1 has 0 sign changes. P(-x) = -x* - 2r° – x2 – 1 has 0 sign changes. Since there are no sign changes for P(x), there are no positive roots. Since there are no sign changes for P(-x), there are no negative roots. Since none of the roots are positive or negative, all four roots must be complex.
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