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Mathematica > Polynomial Equations >

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CountRoots

CountRoots[poly, x]
gives the number of real roots of the polynomial poly in x.

CountRoots[poly, {x, a, b}]
gives the number of roots between a and b.

The limits a and b can be complex, in which case the range is taken to be a closed rectangle in the complex plane.

Count the number of polynomial roots between 0 and 10:

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