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In answering this question it is important that the roots are counted along with their multiplicity. Thus a double root is counted as two roots, and so on.

The degree of a polynomial is exactly the same as the number of roots that it has in the complex field.

If the polynomial has real coefficients, then a polynomial with an odd degree has

an odd number of roots up to the degree, while a polynomial of even degree has an even number of roots up to the degree. The difference between the degree and the number of roots is the number of complex roots which come as complex conjugate pairs.

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Q: What is the relationship between the degree of a polynomial and the number of roots it has?
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