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A rule counting sign changes to bound the number of positive real zeros belongs to:
ADedekind
BDirichlet
CDiophantus
DDescartes
Answer & Solution
Correct answer: D. Descartes
1. The polynomial is written in descending order first.
2. The sign changes between consecutive terms are counted.
3. That is Descartes' Rule of Signs.
_Source: OpenStax Precalculus 2e, Chapter 3, Polynomial and Rational Functions._
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