math

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Can somebody please help me with this problem?
This is the index-„³ 5 6^-5



The radical sign did not show, but the problem is:
5 is the index (outside the radical sign and then 6 is squared to the -5th power (inside the radical sign is under the radical sign)


when adding and subtracting radical expressions does the doubled number go in the inner or outter of the radical

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