Algebra-1

Question Analysis
This question tests the student's ability to simplify a radical expression by factoring it into its prime factors and extracting perfect squares.

Key Concept Explanation
The key concept here is the property of radicals that allows us to break down a square root into the product of the square roots of its factors: .

Step-by-step Solution
1. Factor 128 into its prime factors:
2. Group the factors into pairs: