Question 144844
That depends.  Are you trying to simplify {{{sqrt((54x)^8)}}} or {{{sqrt(54x^8)}}}?



 {{{sqrt((54x)^8)=(54x)^4}}}  whereas {{{sqrt(54x^8)=sqrt(54)*sqrt(x^8)=sqrt(6)*sqrt(9)*sqrt(x^8)=3sqrt(6)x^4}}}