Question 980772
Wording is unclear but might be intended as {{{(sqrt(81z))^(12)}}};


{{{((81z)^(1/2))^(12)}}}


{{{(81z)^((1/2)(12))}}}


{{{(81z)^6}}}, now which will apparently be a positive number of value.


Might be simple enough as it is.


Or,
{{{81^6*z^6}}}