Proof is in the algebraic pudding!  Seriously though, the fundamental theorem of algebra states that every non-constant polynomial with complex coefficients has at least one complex root. A polynomial of degree n has n roots, including repeated roots and complex roots.

The proof of the fundamental theorem of algebra involves showing that if a polynomial doesn't have any complex roots, then it can be factored into a product of linear polynomials with real coefficients. Furthermore, since every real polynomial can be factored into a product of linear polynomials with real coefficients, this means that every polynomial can be factored into a product of linear polynomials.

The complex conjugate theorem is used to show that if a polynomial with real coefficients has a complex root, then its conjugate is also a root. This allows us to factor a polynomial with complex roots into a product of linear polynomials with real coefficients.

Let me know if you need anything else.
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