If $$ y = \sqrt{x} $$ , and $$ y = 6 $$ , what is the value ...

Question Analysis
This question tests the ability to find the input value of a square root function given the output, which is a basic application of the square root function.

Key Concept Explanation
Given the function , if is known, the value of can be found by squaring .

Step-by-step Solution
1. Start with the given values: and .
2. Substitute