Fundamental theorem of algebra | Polynomial and rational functions | Algebra II | Khan Academy
Fundamental Theorem of Algebra - Numberphile
What does the fundamental theorem of algebra tell us about a polynomial
The Fundamental Theorem of Algebra
The fundamental theorem of algebra states that every non-constant single-variable polynomial with complex coefficients has at least one complex root. This includes polynomials with real coefficients, since every real number is a complex number with an imaginary part equal to zero.