Algebra-2

Question Analysis
This problem assesses the understanding of the principal nth root, specifically for even roots.

Key Concept Explanation
The principal nth root of a number is the non-negative real root. For even roots, there are two real roots that are opposites of each other, but the principal root is the non-negative one.

Step-by-step Solution
1. Identify the number and the root: We need to find the principal fourth root of 81.
2. Determine the value: Since

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