Simplify the expression.

Answer:
Option A
Step-by-step explanation
We can write
648=[tex]3^{3}* 3*2^{3}[/tex]
[tex]x^{4} = x^{3}*x\\[/tex]
[tex]y^{8} = y^{3}* y^{3}*y^{2}[/tex]
so we have
[tex]3x\sqrt[3]{3^{3}*2^{3} *3 *x^{3}*x*y^{3}*y^{3}*y^{2}}} \\3x*3*2*x*y^{2}\sqrt[3]{3x*y^{2}}} \\\\18*x^{2}*y^{2}\sqrt[3]{3x*y^{2}}}[/tex]