SOLUTION: I am an online student for Algebra II and the program does not give explanations for problems entered in a specific way. I had a problem on a quiz today which I got wrong and have

Question 605630: I am an online student for Algebra II and the program does not give explanations for problems entered in a specific way. I had a problem on a quiz today which I got wrong and have no idea why I got it wrong. Please explain how to simplify:
2/[3*cbrt(5)]
I tried to multiply both the numerator and denominator by 3*cbrt(5). The answer then would be 2*sqrt(5) over 15. But but this is wrong!
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
I think your problem is the cube root.
Suppose you have
In order to get rid of the cube root sign,
you should do this:
That equals
----------------------------------
So, for your problem,

I checked this punching in numbers:

It checked out- try it
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