How is the Descartes rule used to find the number of roots in an equation?

By counting the number of times the equation changes signs

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By counting positive signs in the equation

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By counting negative signs in the equation

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None of the above

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Solution

The correct option is A By counting the number of times the equation changes signs
Descartes rule counts the number of times the sign changes from either $+$ to $-$ or from $-$ to $+$

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