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(8)^(-2/3)

=> (2^3)^(-2/3)   since 8 = 2^3

=> 2^ (3* -2/3)       since (a^n)^m = a^nm

=> 2^-2

=> 1/(2^2)     since a^-m = 1/(a^m)

=> 1/4
 

ago by Level 5 User (12.5k points)

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