Put a 1 under it and a 1 times it:



Rule: To make a negative exponent positive, move the entire
exponential from the 

top to the bottom if the exponential with the negative exponent is in the top,

or from the

bottom to the top if the exponential with the negative exponent is in the bottom,

and change the sign of the exponent to positive, so 

 is in the top so we bring it to the bottom and
change the sign of the -1 exponent to positive 1. 

So we have 



and we can now erase the 1's in the bottom and the parentheses and 
just have:



but we can't erase the 1 on top.

Edwin