Final answer:
The student's question is about finding an expression that simplifies to 6 √2 when x equals 3, which requires a combination of operations with exponents and radicals.
Step-by-step explanation:
The student is asking for an expression that simplifies to 6 √2 when x equals 3. Given the context of simplifying square roots and exponents, a potential expression could be something involving exponents, radicals, or operations that result in the square root of 2 when simplified appropriately with the given value of x. For example, an expression could be something like (2x) ² where x equals 3, which simplifies to 4 × 3 ² or 36, and taking the square root would result in 6, multiplied by √2 as the final answer. Unfortunately, without additional specific information or options of expressions, it is not possible to determine the exact expression that would simplify to 6 √2 at x = 3.