if 2^x-2^(x-1)=4 then x^x equals

2^x-2^x-1 =4 , then taking common 2^x-1
2^x-1(2-1)=4 , 2^x-1 =4 ,
2^x-1=2^2, simplify
x-1=2, x=3 then
x^x=3^3=27
hence 27 is the required answer

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thanks buddy...
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