How do you simplify a radical expression if a variable with a negative exponent is on the top (as the numerator)?
Your question might imply a couple different forms:
#(x^(-p))/sqrt(q) = 1/(x^p * sqrt(q))#
#sqrt( (x^(-p)) / q) = sqrt( 1/(x^p q)#
or perhaps something else I haven't thought of.
Hopefully this is enough to get you on your way!