- When you are raising a number to a negative power, it is the same as dividing 1 by that power when it is positive. So, 
.
is 125, so we can substitute that in to get: 
- This expression is the same as the one before, but it is negative. This means we can say 
- We can start by writing 
. Now, we can distribute the exponent -1, and simplify. Remember when raising a power in parenthesis to another power, you multiply them:
- We can start by writing 
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