Asked by Tim

My problem is:

4 sqrt 81
I know the answer is 3, but I do not know how they got it.
Answered by Damon
write that as 81^(.25) which is (81^.5)^.5

that is
sqrt ( sqrt 81 )
81 is nine times nine
so
sqrt ( sqrt 81 ) = sqrt (9)
but 9=3*3 so
sqrt (9) = 3
Answered by Gary
Thank-you, I don't know why I did not think of that. I came up with every other number imaginable but that. I think I was trying toooooooooooooo hard!
Answered by kelly
5^1/7 in radical notation
Answered by Dee Dee
(-64)^2/3
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