The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » sci.math.* » sci.math.symbolic

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: when is sqrt(a/b) not the same as sqrt(a)/sqrt(b) ?
Replies: 8   Last Post: Mar 5, 2014 3:34 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
D Herring

Posts: 62
Registered: 8/23/06
Re: when is sqrt(a/b) not the same as sqrt(a)/sqrt(b) ?
Posted: Mar 4, 2014 9:16 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

On 03/01/2014 07:54 PM, Richard Fateman wrote:

> Isn't it possible that sqrt(4) has 2 values, sqrt(-4) has 2 values as well?





Nope. +2 for me!


Honestly, the way math was taught in school, to this day it is easy
for me to see x^2 but hard to see both branches of sqrt(x) for
positive x -- even though they are essentially the same curves. I
think it was all the emphasis on functions having a single output
value for a given input. If sqrt(x) is a function, then...

- Daniel

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.