Change this to:

Since you want to get rid of the square root in the denominator, multiply the top and bottom by giving:

So,

Then if you need to simplify, you can factor out 3 (since 3 x 3 x 3 = 24) giving you:

Not sure what you have here, is it ??3√[16] rasied dot 3√[3]

Thank you so much

Please note that on the second question the 3's are the indexs