Algebra-2

Question Analysis
This problem tests the student's ability to apply 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 for any polynomial with real coefficients, if is a root, then is also a root. This is because the coefficients are real, and the polynomial must remain balanced in the complex plane.

Step-by-step Solution
1. Identify the given root: