Question 399379
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Hi
Might recommend using the following to come up with the solution:
Rules of Exponents:
I.  {{{x^m*x^n = x^(m+n) }}}   
II.  {{{(a^p)^q = a^(p*q)}}}
III. {{{root(a,p)*root(a,q) = root(a,p*q)}}}

[(8a^2b^-1)/(b^2)]^3 = 8^3a^6b^-3 / b^6 = 8^3a^6/(b^3)b^6 = 8^3a^6/b^9