Answer:
18x²y²√6xy²
Step-by-step explanation:
3x∛648x⁴y⁸ = 3x ∛ 2 * 2 * 2 * 3 * 3 * 3 * 3 * x⁴ * y⁸
= 3x * 2 * 3 * x * y * y √2 * 3 * x * y * y
= 18x²y²√6xy²