What is the FTA? (Fundamental Theorem of Algebra)

Question

Can someone tell me what the FTA is in basic terms.  I'd appreciate a detailed explanation.

Answer 1

From Wikipedia.

 

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.