If a polynomial with real coefficients has a root of $$ 4 + ...

Question Analysis
This problem tests the understanding of the Conjugate Root Theorem, which states that if a polynomial with real coefficients has a complex root, then its conjugate is also a root.

Key Concept Explanation
The Conjugate Root Theorem ensures that non-real roots of polynomials with real coefficients always occur in conjugate pairs. If is a root, then is also a root.

Step-by-step So...