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Why must every polynomial equation with real coefficients of degree 3 have at least one real root?

Why must every polynomial equation with real coefficients of degree 3 have at least one real root?
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Why must every polynomial equation with real coefficients of degree 3 have at least one real root?

User Prabhakaran
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Answer: Every polynomial function of degree n≥1 with complex coefficients has n complex toots. A solution repeated n times counts as n roots.
User Abarnert
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