Algebra-2

Question Analysis
This problem assesses the understanding of even roots and their properties, specifically for the eighth root.

Key Concept Explanation
For an even root (n is even), if , there are two real roots that are opposites of each other. Here, we need to find the real solutions to .

Step-by-step Solution
1. Identify the given equation:
2. Recognize that 6,561 can be written as

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