Posted by kozy on Tuesday, May 3, 2011 at 3:14am.
Rewrite with positive exponents. Assume that even roots are of nonnegative quantities and that all denominators are nonzero.(6xy/y)^3

math  Damon, Tuesday, May 3, 2011 at 4:32am
(6x)^3 = 1/(6x)^3 = 1/(216 x^3)