Question 49797
  
   {{{(-3x^2)^-2}}} = {{{1/(-3x^2)^2}}} = {{{1/(9x^4)}}}.  Answer.
 
  I hope it is clear to you now. Whenever the exponent is negative and to make it positive, just bring the base and the exponent as denominator or numerator as the case may be and write the exponent in positive as above.
  
gsm