If it is -(2/3)^4/6 , we can find a real (R) solution for it :
we know (x) ^ a/b is equal with
[tex] \sqrt[b]{ {x}^{a} } [/tex]
so we can say :
-(2/3)^4/6 =
[tex] - \sqrt[6]{ ({ \frac{2}{3} })^{4} } [/tex]
and its solution after simplify is:
[tex] - \sqrt[3]{ \frac{4}{9} } [/tex]
so the correct answer is not in your solutions
