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# Official C3 Exam Discussion WJEC - 24/05/13 Watch

1. I only managed to get up to finding the two values +-2 and +-4 didn't know what to do from there, but still should be 2 marks out of the four at least!!
2. Yeah, same, I was driving home and it popped into my head, if x=0 then |0-10| is greater than 6 not less than so I knew I made a mistake Since I left it as -4<=x<=4 or -2>=x or x>=2
3. I said between 2 and 4
4. I think it was x^2 <= 16 which gives -4<=x<=4
and x^2 >= 4 which gives -2>=x or x<=2

Then you combine them to give -4<=x<=-2 or 2<=x<=4

Edit: Yes I think you are half-right, x is between 2 and 4 or x is between -4 and -2 (I think)
5. I had R(fg) (-∞, 0]
6. I say we stop discussion because we'll get upset losing marks
7. (Original post by priteshp)
I got. Question 10 domain of f-1(x) as (6,7] something like that how did everyone do on the inequailty question?
That domain is also incorrect, by the way.

I'm interested to know what you attempted to get that domain though? And also what you attempted to get your answer for R(fg)?
8. Nothing we can do now! Only M1 left for me.
9. (Original post by Visvim)
Nothing we can do now! Only M1 left for me.
C4 and S1 for me
10. (Original post by L'Evil Fish)
C4 and S1 for me
Good luck mate! Feeling confident? Got a week off now as well
11. (Original post by Visvim)
Good luck mate! Feeling confident? Got a week off now as well
S1 I haven't done properly yet :/
C4 is the hardest so far, so need to brush up on it!
12. (Original post by Tullia)
R(fg) = [0, ∞)
How did u get infinity on Rfg(x)cos I plugged the range of g(x) into the equation into f(x) and ln (0) tends to (-) infinity
13. For the R fg(x) I got [0,infinity), but thinking back over it I'm sure it must have been (-infinity,0]

Did anyone else get the same as me?
14. no ican't remember but i think i had [0,infinity)
15. One of the questions was fg(x) = -0.4, meaning -0.4 is a member of R(fg) so from that I don't think [0, infinity) can be right, unless I've remembered incorrectly.
16. Good point and the value of x turned out to be positive with was in the domain of fg(x) who knows :/
17. (Original post by priteshp)
How did u get infinity on Rfg(x)cos I plugged the range of g(x) into the equation into f(x) and ln (0) tends to (-) infinity
Sorry, it is (-∞, 0] .
18. **** I put down [0, -infinity) does it still count since its only range?
19. (Original post by priteshp)
Sh** I put down [0, -infinity) does it still count since its only range?
If you're asking whether you need to put the most negative value first, then you do.
20. would u lose the mark if u didn't?

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