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To simplify expressions with fractional and/or negative exponents I find it can help if you factor the exponent:
If the exponent is negative, factor out -1.
If there is a fractional exponent, factor out the numerator of the fraction so that the denominator has a 1 one top.
For your exponent this factoring makes the expression:
By factoring the exponent like this we can see what operations we will need to perform:
The -1 (as an exponent) means we will be finding a reciprocal.
The 3 (as an exponent) means we will be cubing something.
The 1/2 (as an exponent) means we will be finding a square root.
And since multiplication is commutative, the order does not matter. So we can do the above three operations in any order we choose!
So now we look at:
and ask ourselves: "What do I want to do first? Find a reciprocal, cube or find a square root?" Cubing 49/25 does not look easy so we will save this for later. Find a reciprocal of a fraction is pretty easy. And, since 49 and 25 are both perfect squares, finding a square root doesn't look very hard. I'm going to start with the reciprocal then do the square root and finish with the cubing:
Important: No matter what order you choose for the three operations (reciprocal, cube, square root) the answer works out the same! So try to choose an order that makes things easier when you have fractional and/or negative exponents.