Fundamental Theorem of Algebra - Expii

As we know, there are plenty of real polynomials, like x^2 + 1 or even x^16 + 1, which have no real roots. The fundamental theorem of algebra is the striking fact that a real (or even complex) polynomial must, however, have complex roots. So just by adding i, the imaginary unit, into the picture, we're able to get everything else!.