Algebra-2

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, its conjugate is also a root.

Key Concept Explanation
The Conjugate Root Theorem ensures that for a polynomial with real coefficients, if is a root, then must also be a root. This is because the coefficients are real, and the polynomial must have real coefficients in all terms.

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

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