Make sure every number and letter inside the
parentheses shows an exponent, even if it's :



To remove parentheses, multiply every inside
exponent by the outside exponent:






Since any number raised to the zero power is 1, the denominator
is just  or .



To get rid of a negative exponent, move it from top 
to the bottom or bottom to top and change the sign 
of the exponent to positive:

So we move  and  from top to bottom and 
change the sign and we now have:



And we can leave the 1's understood:



Edwin