The rule for exponents is that, when multiplying the same base, you add the powers. That is: x<sup>m</sup>x<sup>n</sup> = x<sup>m+n</sup>. So you would need to add the one-third powers, not multiply them.
Also, what do you mean by your "^9" notation? And how did the nineth root turn into a square root?
Also, did you convert from powers to roots because the instructions said something like "express your final answer in radical form"?
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