How do you simplify #(3/5)^-2#?
You can expand this question to make it easier to think about. You can split the index into 2 parts, the (-1) and the 2. Therefore the question would be:
You can then do each bracket individually. The (-1) means you should flip the fraction so the nominator is the new denominator and the denominator is the new nominator:
Then you need to square the nominator and denominator, to give you: