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# Core 3

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1. (Original post by SeanFM)
As long as you see the point I am trying to illustrate. Eg domain (for real values of x) of
Unparseable or potentially dangerous latex formula. Error 6: Image was not produced or one of its dimensions is too small.
\sqrtx
= ..

Go away, potentially dangerous latex message!
Its not showing it
2. (Original post by Ayaz789)
Its not showing it
I am a disaster with latex I have fixed it now but it is on the other page.. it was .
3. (Original post by SeanFM)
I am a disaster with latex I have fixed it now but it is on the other page.. it was .
What about the root of x?
4. (Original post by Ayaz789)
What about the root of x?
The domain of in the reals is..
5. (Original post by SeanFM)
The domain of in the reals is..
Im sorry but i dont understand what you are saying do you mean [1,infinity)
6. (Original post by Ayaz789)
Im sorry but i dont understand what you are saying do you mean [1,infinity)
I am asking you to find the range of values that you can put into that equation (i.e, the domain) and express it in terms of [] or (] or whatever the correct parentheses are.
7. (Original post by SeanFM)
I am asking you to find the range of values that you can put into that equation (i.e, the domain) and express it in terms of [] or (] or whatever the correct parentheses are.
Is it not [1, infinity) though?
8. (Original post by Ayaz789)
Is it not [1, infinity) though?
the infinity is a can of worms once more.. perhaps I should have not picked that. But 1 is not the right value. (Eg sqrt0.25 = 0.5 which exists).
9. (Original post by SeanFM)
the infinity is a can of worms once more.. perhaps I should have not picked that. But 1 is not the right value. (Eg sqrt0.25 = 0.5 which exists).
Yeah i know that but just stay with whole numbers for now, i thought infinity is always a curved bracket?
10. (Original post by Ayaz789)
Yeah i know that but just stay with whole numbers for now, i thought infinity is always a curved bracket?
That's not how it works - you can't exactly 'stay with the whole numbers' - if the function exists for x=0.25 for example then that's going to be part of your domain.

And I do not know.. I have never studied such things I guess it makes sense though.
11. (Original post by SeanFM)
That's not how it works - you can't exactly 'stay with the whole numbers' - if the function exists for x=0.25 for example then that's going to be part of your domain.

And I do not know.. I have never studied such things I guess it makes sense though.
just saying infinity is always a curved bracket ahh okay nw! Anyways im going sleep so ill message you tomorrow
12. (Original post by SeanFM)
And I do not know.. I have never studied such things I guess it makes sense though.
The reason that you always use the curved brackets is because []/() notation is shorthand for being .

But a problem comes up when you trying because then you require but infinity is not a member of the reals, so you can't say , i.e: it can't be inclusive. It has to exclude with a . i.e: the curved bracket.

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