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how to determine this

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given       

{  x  =  (a)^-4/3  ,  a>0  }     x   is positive or negative   how to determine

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x = (a)^-4/3          ,  a>0

the sign of x is totally dependent on the sign of 'a'    

if 'a' is positive then x is positive  ,    if 'a' is negative then x is negative. here x is positive.
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