Re: sqrt[x^2]
- To: mathgroup at smc.vnet.net
- Subject: [mg9848] Re: sqrt[x^2]
- From: we048532 at bs47c.staffs.ac.uk (WOOD D.J)
- Date: Fri, 28 Nov 1997 05:36:04 -0500
- Organization: Staffordshire University
- Sender: owner-wri-mathgroup at wolfram.com
ZenArcher (Zen at archer.com) wrote: : Well I know this is really elementary, but I just don't understand this : result: : sqrt[x^2]=sqrt[x^2] : sqrt[4^2]=4 : Why doesn't Mathematica tell me that the Square Root of x^2 is x, but it : will tell me that the square root of 4^2 is 4? If x is a negative value it is not the case, for example if x is -2 then the square root of x^2 is 2. so the square root of x^2 is not allways equal to x. -Dave