Homework Help: Algebra Help Radical notation

Posted by Tim on Saturday, March 15, 2008 at 1:11pm.

My problem is:

4 sqrt 81
I know the answer is 3, but I do not know how they got it.

Algebra Help Radical notation - Damon, Saturday, March 15, 2008 at 1:29pm
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
- Algebra Help Radical notation - Gary, Saturday, March 15, 2008 at 2:05pm
  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!
- Algebra Help Radical notation - kelly, Thursday, January 15, 2009 at 3:45pm
  5^1/7 in radical notation
Algebra Help Radical notation - Dee Dee, Tuesday, July 31, 2012 at 6:48am
(-64)^2/3

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