What do you do when you have a number which is squared to a negative number. e.g 2^-2
Look through this post
http://web2.0calc.com/questions/indices-especially-negative-indices
If you have 3^-2, this means that you need to take the reciprocal; make it 1 / 3^2 = 1/9.
(When you take the reciprocal, turn the negative exponent into a positive exponent.)
So, 4^-3 means 1 / 4^3 = 1/64.
Etc.
Look through this post
http://web2.0calc.com/questions/indices-especially-negative-indices