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January 29, 2015

January 29, 2015

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

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 1:29pmwrite 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 2:05pmThank-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 3:45pm5^1/7 in radical notation

- Algebra Help Radical notation -
- Algebra Help Radical notation -
**Dee Dee**, Tuesday, July 31, 2012 at 6:48am(-64)^2/3

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