Algebra-1

Question Analysis
This question tests the understanding of the domain of a square root function. The student needs to recognize that the expression inside the square root must be non-negative.

Key Concept Explanation
The domain of a function is the set of all possible input values (independent variable, usually ) for which the function is defined. 

Step-by-step Solution
1. Identify the condition for the function to be defined:
2. Solve the inequality:

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