any1 know the answer to "0 divide by 0"? (1 Viewer)

Jeo

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Originally posted by sarah_#1_eel
It equals...Error 2 :confused:
yes..... it can only be positive.... but why

I was taught that a square root of any number, is any number tha multiplies itself to give the required number, hence sqrt 36 = -6 and 6.. but -x is not a solution for sqrt x^2..... why?
 

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Originally posted by Jeo
but -x is not a solution for sqrt x^2..... why?
it is part of the solution isn't it??

but i doubt ppl simplified to that state when exam comes coz its unnecessary
 

Jeo

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no.....

sqrt(36) = +6 ONLY

for x^2 = 36, x = -6, +6
 

Lexicographer

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I disagree. Even in 2unit root 36 is +/- 6, because you must take BOTH values into account for calculus etc
 

Lazarus

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Originally posted by Jeo
but -x is not a solution for sqrt x^2..... why?
I suppose you could argue that the negative sign always disappears.

sqrt(x<sup>2</sup>) = sqrt(x*x) = sqrt(x) * sqrt(x) = (sqrt(x))<sup>2</sup> = +x
 

Jeo

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Originally posted by Lexicographer
I disagree. Even in 2unit root 36 is +/- 6, because you must take BOTH values into account for calculus etc
look, by definition, sqrt(x) is always positive.
 
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0 = nothing

if you start with nothing you end up with nothing
*sound logical*

so 0 + 0 = 0
0 - 0 = 0
0 * 0 = 0
0 / 0 = undefined

but then why is anything multiplied by 0 = 0??
shouldn't 2 * nothing = 2 cause you have 2 to begin with??


:confused: :confused: :confused:
I have come to the conclusion that maths is confusing and unlogical and we shouldn't have to learn it!
 

Jeo

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Originally posted by boredofschool
0 = nothing

if you start with nothing you end up with nothing
*sound logical*

so 0 + 0 = 0
0 - 0 = 0
0 * 0 = 0
0 / 0 = undefined

but then why is anything multiplied by 0 = 0??
shouldn't 2 * nothing = 2 cause you have 2 to begin with??


:confused: :confused: :confused:
I have come to the conclusion that maths is confusing and unlogical and we shouldn't have to learn it!
omg... lets go back to kindy

what does 5 oranges = 5 oranges

and what does 5 nothings = nothing

:rolleyes:
 

jogloran

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Hey, think of the relation f(x) = sqrt(x). It has domain x>=0 and range y>=0.

However, a square root really has two solutions: the positive one is the 'principal' square root, and that is the one we use commonly. The other is just as valid, though.
 
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Jeo

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oh well ---- if you get a question when you have to square root something, do you stick to only the positive, or use pos and neg?
 

Jeo

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hmmm i guess when its in a function, its always positive, and expression is pos and neg...
 

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Originally posted by Jeo
oh well ---- if you get a question when you have to square root something, do you stick to only the positive, or use pos and neg?
both postive and negative
 

Jeo

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but its > 0 for a function ------------------------
 

Jeo

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Warning: Division by zero in /home/lala/html/community/admin/functions.php on line 72
 

iambored

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Originally posted by Jeo
oh well ---- if you get a question when you have to square root something, do you stick to only the positive, or use pos and neg?
don't u just put +-

and i would say 0/0 is undefined
wonder what the calculator says
 

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