Quick hybrid functions question

[Andiio]

Just a bit of the nitty-gritty stuff:

If asked to write a hybrid function,

say for example y = |x-1|

When writing the domain for each function, do we have to express it with only x as the subject?
What I mean is that, if, say, you write:

y = x-1, x-1>0
as opposed to:
y = x-1, x>1

Would your answer still be accepted, and would any marks be lost?

Thanks!

[Greatness]

You might? Depending on the examiner. Just make it easier for them, and write it as x>1
Also is x-1>0 technically stating the domain? (serious question)

[Andiio]

You might? Depending on the examiner. Just make it easier for them, and write it as x>1
Also is x-1>0 technically stating the domain? (serious question)

Yeah it was a relatively simple example, I was thinking what if there were some more complicated functions with complicated domains and everything.


Also, another Q: if a 'HENCE' question comes up, or if a question asks you to 'use the value obtained from part 1', and in part 1 you had to give a rounded answer: would you use that rounded answer in your calculations or is it best to always use the original/exact values? Just wondering if there were any questions where they specifically ask us to use our previously calculated and round values.