Which expression is equivalent to 3 square root 216x^27? 6x3 6x9 72x3 72x9

What is asked in the problem is the cube root of the given expression which is a product of the cube root of the numerical coefficient, 216, and that of the the variable, x^27. The cube root of 216 is 6 and that of x^27 is x^9. Thus, the answer is 6x^9.