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April 1st, 2004, 10:32 PM
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Shrapnel Fanatic
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Re: Math Question
You can not have numbers less than -4 in the domain, as then you would have the square root of a negative number, which is impossible in normal math. This leads to being unable to have a negative number in the range, as there is no way to get a negative number by taking a square root. Any value in the domain leads to a number that is either 0 or positive.
When you have y ^ 2 = x, y can be positive or negative because either a positive or negative value squared can lead to x. But when you have y = x ^ (1/2), you do not have negative numbers, as this is not at all the case of y ^ 2 = x. In the square root case (ignoring complex math, which you are not doing), you are limited to taking square roots of positive numbers (or 0), and square roots are always positive.
[ April 01, 2004, 20:35: Message edited by: Imperator Fyron ]
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April 1st, 2004, 10:33 PM
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Major General
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Re: Math Question
In math class, sqrt(x) is defined as "The positive square root of x."
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April 1st, 2004, 10:34 PM
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Corporal
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Re: Math Question
I got a headache of just reading this thread. 
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April 1st, 2004, 10:47 PM
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Sergeant
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Re: Math Question
Why do I have the picture in my head of Scotty speaking to a modern day computer (they went back in time) "Computer?"..."Computer on"...then he had to do it by hand, just think when we can just ask a computer these tedious questions and can focus on the "ideas" yea right, thats the ticket...
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April 1st, 2004, 10:55 PM
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National Security Advisor
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Re: Math Question
Ok, so my problem was simple I guess. I forgot the true mathematical definition of square root. I thought that the sqrt(x²)=x, but that is incorrect. Actually the sqrt(x²)=|x|
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I used to be somebody but now I am somebody else
Who I'll be tomorrow is anybody's guess
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April 2nd, 2004, 06:29 AM
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Shrapnel Fanatic
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Re: Math Question
You guys in five short Posts or so just totally ruined any desire I might have had to return to school. 
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Creator of the Star Trek Mod - AST Mod - 78 Ship Sets - Conquest Mod - Atrocities Star Wars Mod - Galaxy Reborn Mod - and Subterfuge Mod.
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April 2nd, 2004, 08:33 AM
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Sergeant
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Re: Math Question
Quote:
Originally posted by Atrocities:
You guys in five short Posts or so just totally ruined any desire I might have had to return to school.
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Atrocities, you are killing me old boy. Wait for me to get my hands on a camera and I'll show you the most painful math you will ever see.
(I will be back with a picture in a few days; I promise you)
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